Here is the custom enclosure I built for my 2 water dragons. They are doing really well.

It is just a closet under the stairs that I converted into my mini-reptile room. In this room I have 3 snakes, a beardie, and the 2 WDs. Oh, and a dubia colony...

It isn't finished yet, but functionally, it works fine.

I have a MVB (Mega-ray 100SB) that keeps the UVB and temps just right for them.
For humidity, I have a few potted plants and keep the subrate in them very moist. The rest of the enclosure is just plywood lined with stick on tiles. It is very easy to clean and disinfect when needed.

They love to climb. Tall and lots of vines and basking spots are great. A nice quiet hide covered with leaves (fake or real) for hiding is good.

For the little one, Pheonix Worms are a great idea. They pack a punch from a nutrition perspective. I start them on that, then move to supers and dubias.

They mess up their water pretty fast. They do all their poo'ing and shedding and stuff in there. So I went with a large cat litter pan that offer plenty of room for swimming and soaking plus I can easily remove it 2 times a week (it gets nasty fast) and clean and refill it. I also have a cheap filter in it, but it just helps keep the water looking clear, but there is always big chunks of skin, poo, etc floating around...