You, your mother and any lizard you wind up with will be far better off if you get your equipment properly set up prior to getting the lizard.
You can make almost any box work with the right attachments but I would highly recommend getting something specifically built for reptiles.
They don't have to have enough water to swim in, a bowl is sufficient. They do tend to smash against things like the sides of a clear cage.
Do some more research, go to a few reptile stores if you can or maybe a show.
They're really neat creatures, not hard to keep, but need more from the keeper than you seem to have so far.