Meph this is what i have my versi in. He molted like a week ago so he's looking good.
His vial is simple and what ive had him in since i got him at 1/2". Hes molted twice and is probably 1.25" now.
A birds eye view:
All it is is substrate, One leaf off of a plastic plant, and a bottle cap for water to keep humidity up. You don't need to use a plastic plant, anything that they can anchor their webs to works just to help them make a more secure web.