Because I live in So. Cal. and there's not a lot of water around when out
riding, I carry a fanny pack filled with cut up carrots and apples. Both
contain lots of water and fiber and Bitsy loves the treats.
I throw a few ice cubes in the zip lock with them...keeps everything nice and
cool and crunchy.
And in a pinch, I've been known to avail myself of her stash......
Carrots also, of course, have lots of Vitamin A.