Tap water is free

 (Photo by Unknown)

Bottled water costs $2–$10. Tap water does not.

In Europe the water you're served at a restaurant is almost always of the bottled sort and costs $3 to $10 per bottle—and, by the way, you have to ask for water before you get any (it doesn't arrive on the table automatically, as in the States), specifying fizzy (sparkling) or still.

But if you ask for tap water, you'll get it for free (don't worry; tap water's safe everywhere). 

In the interests of full disclosure, I have to admit I don't follow this particular tip myself, cause I like fizzy water and don't mind paying a bit for it. I even drink it at home.

Culinary tours links