For now, I would place him into a 5 or 10 gallon aquarium with a sealed lid, and put down some substrate, such as sand, gravel, or smooth stones on the bottom, as well as plants to hide by. You will need a water conditioner, I use this product and it works fine for all 6 of my amphibians: http://www.petland.ca/media/catalog/...5561219761.jpg

Refresh 25-50% of the water every 2 days, in order to keep pH and Ammonia levels in check.

I would suggest a good filter, but make sure your tadpole cannot get sucked up. We'll guide you through as your tadpole matures into a frog.

One thing we'll really need to know is: What kind of frog is he/she? A picture would work magic in helping us identify your tadpole. If it's a bullfrog tadpole, I'll be able to tell. I see them all the time at my nearby lake.

As for food, frozen then boiled lettuce and then crushed into little chunks works fine, as well as thawed bloodworms. I can link you an article on tadpole raising.

As for when he/she is an adult, as he/she matures they'll need a 30 gallon tank, and for adults, a 55 gallon tank is the minimum, whilst a 100 gallon would be preferable. I can give you a rough idea of how a juvenile/adult bullfrogs tank should be arranged, and examples as well.