If anyone is cruising or taking a land tour in Mexico please be extremely cautious about drinking ANY alcohol there. American tourists have died or been seriously impaired in Mexico consuming just 2 mixed drinks some made with tainted tequila. There have been over 3 dozen incidents that have occurred And these are occurring at numerous resorts.
Many victim couldn't remember what happened to them or how they even got home. Some had hallucinations, frightening images and loss of free will. Some said that they were terrified and couldn't understand why. Others drowned, went into a rage or suffered concussions. Reports seem to indicate that people are being spiked with something purposely.
The Mexican Government has acknowledged that the nation has a problem with adulterated alcohol. If you drink out of a bottle, be sure that the bottle cap is still sealed and that the label has not been tampered with in any way. I would strongly recommend not going on a Pub Crawl in Mexico. And you thought that you just had to avoid the water.