None of us has had even a twinge of Montezuma's Revenge since our arrival. We've even eaten tacos on the street and seafood tacos in the seafood market (right next to where the fishing boats come in--there is a healthy commercial fishing industry in Ensenada). No problems.
Still, we drink bottled water. We finally got a "porta garrafon" yesterday, which is an Rubbermaid apparatus upon which to turn a big water jug upside down. We can keep it on the counter. I was told that I can buy the "garrafones" (jugs) in the convenience store across the street, and you can fill them up for 10 pesos (1 dollar). Or there are trucks that deliver them...they just drive around honking their horns hoping you'll come out of your house with your empties.
So today's the day to get the garrafon. A red letter day.