Using a bit of bleach is a much better practice than using plain tap water. I personally splurge on water from the botell?n because I prefer to be short on cash rather than complaining about gastritis. I've estimates as high as 80% or more of the population suffers from various degrees of gastritis. The cumulative effects of doing things like brushing your teeth with tap water, drinking and eating from glasses and plates that are still wet with dishwater, and indiscriminately patronizing random comedores and chimichurri stands (beware of their salad especially, even more than the meat that is "50 shades of gray") will put you on the wrong side of the intestinal parasite fence. I'm told it is a very uncomfortable place to be.