Nice thread Queenie.

I take a bottle of water everywhere. Difference being that I keep it in the freezer until just before we go out. It defrosts quickly enough to drink but keeps cold for ages. If it's a large bottle - freeze half and top up with cold before you leave.

I second the Antinal. My friend in Cairo swears by it - her kids range in age from 5 to 18 and she uses it for all of them. We bought a couple of boxes back with us last time we were there, though haven't needed to use it fortunately. It can be used if you're pregnant or breast feeding and for very young children.