I think I read somewhere that they only need a couple tablespoons of water to put their eggs in. Can't see that's real effective for offspring longevity.

Have you thought about moving them? When I was a kid, we used to capture frog eggs and put them in a jar and watch them grow from tadpoles into frogs. It's fairly easy to do. They don't all survive, of course, but it was very interesting.

You could just move them to a container of water outside and put it in the shade.

Those tadpoles are the most effective mosquito larvae eaters - ever ! Wish they would stick around all year long .