you seem to know lots about these! do you really put water in the actual pitchers or is this a myth. i havent because even though most caresheets say that you should i saw a few that say you shouldnt because they wouldnt in the wild because they have cap things that stop rain getting in.
do i have to keep them under a heat light and do i have to put them in the fridge for the winter?

oh! and they are N. alata if this helps?

Check the link I posted. Tropical plants need it warm year-round, temperate plants need winter dormancy. If it's Asian pitchers you have, then they need it tropical.

If you don't have a fluorescent light over them, keep them in a sunny window.

Don't put water in the traps -- they secrete the insect-drowning fluids themselves. And yes, the cap prevents rainwater from getting in. (A few primitive species from Australia actually rely on rain to fill their traps, but most prevent it.)