Can't answer about feeding, but with regards the habitat, the water bowl needs to be big enough for her to have a good wallow in the water - judge by her size.
As vgorst says, large cat litter trays are popular - not very attractive, but sturdy and cheap.
As regards the viv, making your own will be the way to go, or converting an old wardrobe or similar.
There are quite a few step-by-step builds in the habitat section of this site - remember to look in the habitat pictures subsection too. A good trawl through those pages should give you some sound ideas for a great build when you can manage it.