I am glad to hear that your intentions are good. In the wild, these toads are found in varied habitats. They are from the Sonoran desert of Arizona and are found in areas with and without permanent water supply.

They are burrowers (and also can make a home out of a rodent burrow) as are most desert dwelling toads. Make sure you provide adequate substrate (I would recommend at least enough for it to completely bury itself. If it is still growing, your new found friend could possibly achieve 8 inches SVL (snout to vent length). They are the largest native toad in the US.

Whether or not you provide a permanent soaking area is up to you.

As for substrate, I like to use finely ground up coconut husk and reptile sand (I use 3 parts coco to 1 part sand, slightly moistened).

These toads are primarily nocturnal during their prime active hours, the temperature can range from mid-70s to low 90s... Anything in that range would be ideal...

For feeding; in the wild, they will eat pretty much anything that can fit in their mouth (even small snakes, lizards, mice and beetles)! You would be fine using gut loaded/dusted crickets and roaches. Field plankton from areas not treated with pesticides can also be offered. During summer monsoons, winged termites emerge in swarms and seem to be a staple in the diet of these guys.

I hop you find this information useful... They are among my favorite toads... If only they were legal to have as pets in the state of California...

Cheers!