Mice setup. 3 ?'s

[TylerxToxic]

i'm getting 2 10 gallon tanks tomorrow and i'm going to put a male and female mouse in one and then when the female gets pregnant I was going to put her into the other 10 gallon tank. but, what i'm wondering is where do I set up the little water thing that goes on the tank? I forgot what it was called. and what is a good size container to keep the the baby mice in?
i'm going to separate them by sex. good forum for how to find out the sex????

Thank you. =]

I forgot to add this, if I had hardware clothe over the top of the tubs is one heat lamp good enough to keep all the mice warm. like if I put it in between them.