Had they invented hand gel back in the day?
We were very pernickty about hygiene and did not eat salad, have ice etc etc in case the local water was used. Hotels and some driver/guides provided bottled water. However, we did stay in some swanky places as we were on holiday, so balls to cost!
I've got a bit of a grumbly tumbly which is definitly not food poisoning, more likely caused by eating curry non-stop for two weeks and my insides were not prepared for it.