I bought a terrific fanny pack from Eddie Bauer last summer that holds a water bottle. It was a little over $20, as I recall. It's a bit larger than most, but I LOVE being able to slip my bottle into it, so I don't have to lug it around. And, with the extra room, I can easily fit my camera, film, maps, sunglasses and wallet.
p.s. You used to get a fanny pack for free when you used your American express card for a "white glove treatment" package. Dunno if they still do it...but I have a couple little f.p.'s in my dresser drawer to show for it. They aren't the most durable, but they definitely do the job, and would work well, I'd think, for kids.
"It's the time of your life, so live it well..."
Greg K.
Forest Hills, NY
Grand Floridian: '96,'97,'99
Disneyland Hotel: '00