We used to have guinea pigs. Don't give them celery as it is too
stringy. We gave our guinea pig pellets that are found in pet shops and farm supply stores.
Give it a water bottle.
My husband made a cage for ours. We put newspaper on the bottom so we could change it often
We had a little house about the size of a shoe box at the end of the cage so they can get some privacy if they want it.
One of ours lived 10 years.