Boca Prins, Mangel Halto & just about any spot with my little family.
My advice, for what it's worth anyway...
Our doctor told us (our son is 4 months old) that if we are thirsty in the heat then the baby will be also. Also, no water (other than what is used to make formula) until the baby is 1 yr old, but Pedialyte is acceptable for dehydration if they won't take formula/breastmilk. Check with your pediatrician so you have their recommendations before you go.