garter snake long island ny

[nyjon]

with my luck i found a little brown snake what seems to be a garter snake. it made its way inside the office building i work in and found it by the elevator. i put it inside a brown lunch bag and im not sure what to do with it its tiny about 5 inches long...im not even sure how or what i would feed it? do they require heat and hides like other corn,milk,king snakes? i can post pictures of it when i get home. thanks!