A lot of people here will say that water bowls are an absolute must at all times for all frogs, but I don't buy it. If they aren't changed every day, they're just a breeding ground for disease. Terrestrial frogs don't have constant access to standing water. If they need water, they bury themselves in moist soil. I've witnessed this when I left my gray treefrogs in someone else's care for a few weeks and they weren't misted enough- the top of the substrate was bone dry, yet the frogs survived just fine by burying themselves. I've given my frogs a heavy misting and left them for 3-4 days with no water bowl plenty of times, and they aren't even sitting on the substrate when I return. They're sitting on their usual perches, high and dry. In the wild, I've seen these guys basking in direct sunlight on trees and buildings in the middle of summer, far from the nearest source of water.