Okay, I'm going to put my two cents' worth in, take it or leave it you youngens....
Firstly, Bearded Dragons are ARID creatures, requiring DRY environments... Water Dragons are "tropical" creatures, requiring TROPICAL environments... I know you've said you've "figured this out already", fantastic!
Secondly, DO NOT house Bearded Dragons TOGETHER... They WILL fight, you WILL have missing toes, tail-tips etc, you WILL have at least one animal constantly stressed, end result you WILL have one die... Is it worth it?
There are SO many threads on this forum already stating this, do what others before you have done, and look 'em up!