Our AEO always blamed the local water for the fact that he always had the squits the next morning after arriving at Akrotiri. I pointed out that since landing the day before he had consumed several cans of Keo (the first was always handed to you as you climbed down the steps from the aircraft}, switching to brandy sours in the mess, then prodigious amounts of kokkinelli in downtown Limassol in the evening, and that as far as I could see he hadn't touched a drop of water on the island.
He still blamed the water!