Sun Burn Remedies?

We both tried cold baths with oatmeal, as we also read that somewhere else, and Carmen took a cold shower which broke her down pretty good. We're in a house on Lake Atitlan in Guatemala, with no means of transport, other than taking a small boat taxi to surrounding towns of Panajachel and San Pedro. Tomorrow we're going to San Pedro though to get some groceries, and will get some Aloe Vera for sure, and possibly some of the other mentioned things.