A large handul of hay for our two along with some Gerty Guinea pig food, (give them about the packet recommended amount for 1 but they never eat it all in 24 hours) and about a teacupful of veg, celery, spring greens, cabbage, broccoli, brussel sprout, rocket (satsuma, tomato, apple and carrot occasionally) and they have my 4 year old son trained to bring them a dandelion leaf each when he's in the garden!! I tried to change them to pellets but they weren't having any of it. They are rather plump guinea pigs though.