When eating at a sit down restaurant, rounding up is appropriate and all the locals
will give nothing more than this, however at restaurants in Prague's tourist
district, where service is unfortunately worse, tips of about 10-15% are expected.
Instead of encouraging poor service, only tip what you feel is appropriate at tourist
restaurants or follow the locals and just round up.
Mineral water, juices, and tea are popular and commonly consumed in the
Czech Republic. Of course other drinks are also available, including coffee,
soft drinks, and milk.
However, Czech Republic is known for their alcoholic beverages and beer is the national
beverage, something that is very apparent after just an hour or two in the country.
While the Czechs do have some imports, most beers are local from breweries that
have given the Czech Republic a reputation as having some of the world's best
beers. If you're looking for a more localized and less available alcoholic drink
try becherovka, an herb-based drink, or absinth, which can have
some bad side effects so be careful. If you want something more familiar, Czech
Republic has all the popular international beers, wines, and hard liquors available
Generally speaking, the tap water is safe to drink in the
Czech Republic, but check with locals for any particular regional differences.
Also, many people may have troubles adjusting to the local tap water, as it will
most certainly be different from what your system is used to.