I would suggest some sort of water purification, probably Iodine based. If we are afraid to recommend this based on medical fears, then what good is it to prepare? Hey, maybe you'll get sued--and maybe lives will be saved.

There comes a time to go out on a limb--comments anyone??

Regards, Vince

Edit: My apologies if you were asking about preparedness solely for children. Anytime you are dealing with kids you must be extremely careful about dispensing chemicals of ANY sort--especially if parents are not consulted beforehand. My initial reply referred to adult-directed kits only.