my finance caught 3 eastern garter snake 3 different sizes one sizes from 1-3 from all one big two small need to know food for them thanks?

we need to know what types of food to give them :) i tried google n wanted to copy n paste didnt work... but i just need a list for the foods of wha they should b eating :) i have bedin plus a few leaves n twigs n a light for them im just wanting to no wha food to feed them 2nd time having garter snakes last time i was told they eat only bugs so im not sure (was 16 when i had one im now 22) anything will b helpful