You'll easily get through a 1.5 litre bottle of mineral water a day when temps are over 30 degrees. If you do decide to imbibe, alternate alcoholic drinks with non-alcoholic drinks. Altitude has the effect of getting you drunker, faster. Your usual limits will be lowered the first few days at altitude - pace your drinks. Never drink alcohol in a country where there are strict laws forbidding or restricting its importation and consumption.
Public drunkenness is frowned upon in some countries - and a jailable offence in others.
Know your limits with stronger drinks. Keep in mind that many countries have speed limits and blood alcohol levels that are lower than the UK's limits. And don't drink and drive - besides a hefty fine, some countries also have mandatory imprisonment. For example, just one pint of beer will put you over the limit in Sweden, where driving while intoxicated is a very serious offence. The BBC is not liable for the contents of any external internet sites listed, nor does it endorse any commercial product or service mentioned or advised on any of the sites.