Honestly man if you have an extra aquarium or even an extra tub sitting around just put a bowl of dog food in there, a toilet paper roll and a lot of crumpled or shredded newspaper so they can hide and stuff. A water bottle for small animals is $3.50 so just pick one of those up and you can always keep your rodents a few days later. Personally i have an extra rat cage that i used to have my dumbo's in, now its the "snake food that wasn't eaten when it was supposed to" cage.