You've just crash landed in a remote jungle....

I'm not convinced at all by the sheeting - it won't do much to protect you from real exposure if your cold and wet through and temperatures at night drop significantly below 10C and water storage can be improvised especially if you have a good blade to hand.

Plastic sheeting can be used to collect water, protect you from water, form a hammock to get you off the ground, it could be used to make a rain mack, it could used to collect water and evaporate it to get salts. The chances are you will get ill and therefore water and salts are essential. That's the way I think about it anyway. Matches will most likely get waterlogged and the ease of starting a fire in a jungle with the humidity as high as it is would be most likely be beyond most people. The advantage though is the fire and smoke would help people find you. The other solution of course is that if the plane had clear a large enough section of the forest that you can view through the canopy then the compass could be broken down and the glass used to focus sunlight to start a fire. I think what you take would depend on who you were tbh. If I were injured I would take the duct tape and a way to start a fire to cauterise the wound. Survival is adapting to your environment so without knowing the exact environment eg altitude etc I wouldn't make the decision.
 
As I said, fresh water is easy to find, uncontaminated water isn't. A simple WPK such as a life-straw eliminates this for the duration of your time in the rainforest. The plastic sheet is easily improvised using very common resources in the rainforest. Uncontaminated water is not so easily found or more importantly recognised.

What are you expecting it to be contaminated with?
 
My main issue with the scenario in the op is 28 days isn't long enough to cobble a still together out of the plane wreckage and make my own booze if I had the time and one of the plane seats bodged into a deckchair I might just stay no need for rescue.

You can ferment prison hooch in a week to ten days depending on sugar content of what you use. It'll put you legless, but rot your gut at the same time.
 
Swiss army knife and duct tape.

21st century construction kit.
Fishing spear.
First aid bandages and splints.
Bug trap.

Gaiters
Shoe / clothing repair.

There are plenty of strut members, beam members in a jungle environment but unless you can find a sisal plant, other strong grasses or are good at stripping bark, finding tension members is harder.

Hence my gut choices. It shouldn't be too hard to create fire if you can find or make dry tinder from mosses and either strong sunlight (I wear glasses :D) or by friction. Natural moisture from succulents may get you through a few days, I would be confident about drinking dew or even spring water near the source. Food would not be essential every day. If you have a working analogue wristwatch and know which hemisphere you are in, you can navigate by the sun or mark your progress by signs on the ground.
 
Not a huge issue if the water is relatively fast flowing.

Bacteria and viruses are the natural problems. There's also man made. Including the waste dumped from illegal logging camps and drug laboratories. I watched a documentary about making cocaine once and what those guys were pouring into the rivers and what it was doing down stream was horrific. Bleach. By the barrel. At several barrels. For one batch.
 
Obviously its an assumption but usually magnesium kits have a striker with them. Problem is given the environment and options most of the options would just prolong how long an inexperienced individual would last and less likely to sustain them for a month.

Using a machete properly is a skill in itself but most people with common sense could use one for basic operations.



Regarding catching prey... all your gonna do running around a jungle with a machete is tire yourself out and possibly do yourself an injury, most animals of any size you'd find in a jungle will sense you coming a mile away.

The point I, and castiel, were trying to make was that even a basic piece of equipment requires some skills to use. To get the most out of a machete, without chopping off a limb is quite a skilled operation, same with shelter building, fire starting, clean water identification and all the rest.

As for catching animals, well I'd be experimenting with spikes and, pits and snares rather than chasing an animal with a large knife! Likelihood of catching anything big would be pretty slim but catching rodents I think I'd have a reasonable chance at.

As for sheltering off the ground with a sheet, other than working out how to use the sheet as a hammock you also have to remember most of the wildlife in the jungle that is dangerous is not large mammals, in fact it's unlikely you'll see one, snakes and insects on the other hand will be all around, including up that tree you just took shelter in...;)
 
What are you expecting it to be contaminated with?

Pretty much anything, in the rainforest aside from the usual dysentery, cholera, typhoid and the like, you also have parasites and so on which infest the water supplies and surfaces you would collect water from.

There are relatively safe sources of water from the dew that forms on the large leaves , inside some nuts and fruits etc, but again there is a risk involved here from parasites and surface contamination. Also collecting rainfall is, as ironic as it sounds, quite difficult as in a deep rainforest the canopy would act essentially as an umbrella, meaning your rain has seeped through a whole range of surfaces and would be contaminated with various amoebas and parasites which can cause acute and serious illness very quickly. There is a parasite, I forget what it's called, that is endemic in most water supplies in a rainforest which can cause serious illness quickly and can be fatal, it can infect through drinking or through the skin, so don't go jumping in any rivers or lakes naked.

The easiest way to combat this, given the inherent difficulty in building and maintaining a fire, at least initially is having a water purification kit. Especially with such limited choices on supplies.
 
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Plastic sheeting can be used to collect water, protect you from water, form a hammock to get you off the ground, it could be used to make a rain mack, it could used to collect water and evaporate it to get salts. The chances are you will get ill and therefore water and salts are essential. That's the way I think about it anyway. Matches will most likely get waterlogged and the ease of starting a fire in a jungle with the humidity as high as it is would be most likely be beyond most people. The advantage though is the fire and smoke would help people find you. The other solution of course is that if the plane had clear a large enough section of the forest that you can view through the canopy then the compass could be broken down and the glass used to focus sunlight to start a fire. I think what you take would depend on who you were tbh. If I were injured I would take the duct tape and a way to start a fire to cauterise the wound. Survival is adapting to your environment so without knowing the exact environment eg altitude etc I wouldn't make the decision.

You could also use the glass from windows for that too.

However if we take the spirit of the OP perhaps we should argue that instead of catching fire it lands in a large river in a jungle and you just get out, with your two chosen objects, before the whole thing slips beneath the water, gone for good!
 
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