I need to top up my windscreen washer fluid but i'm confused as to how much i should put in because there doesn't seem to be a max/min indicator telling me where i should stop.. in fact, i don't even know where the washer reservoir is!! all i see is the tube:

any idea where i can find the max/min mark? or maybe i should just top up a little bit at a time until i see the fluid in the tube?
and i've been told that it's not good using bottled mineral water to dilute the washer fluid... is this true or false??

any idea where i can find the max/min mark? or maybe i should just top up a little bit at a time until i see the fluid in the tube?
and i've been told that it's not good using bottled mineral water to dilute the washer fluid... is this true or false??
