Best of luck for the weekend mate
In terms of kit I kept it very simple, I didn't buy into the whole triathlete promotion. It is very much aimed at mid-life crisis middle aged men (who typically have a little bit of money to waste). I will always state it is the engine not the equipment.
That being said, here is what I used:
Speedo swim shorts and half mask
Trek race bike (just carbon fork and seat), upgraded the seat and pedals and added some aero bars (these are a true must!).
Then had some aasics running shoes (selected for my style of run).
Clothing: Padded shorts and cycle jersey with basic helmet, basic nike run shorts and running vest.
Supplements: Sports beans, electrolyte tablets + lots of water
Tried to keep it basic as you can see. There is noting more rewarding than on the last 5miles on the bike I was storming past people on $5k+ bikes on my $500 bike