RE: Bottled Water drying up
It is a good idea to filter tap water to remove the chlorine and other organic (containing carbon) matter that gives the water a bad taste. This is what the bottlers do, and restaurants should do it as well.
Some restuarant water is vile, but then again, they want to sell you beverages. Some areas have so much chlorine in their tap water you can taste it in a "fountain" soda, which is made on premises from tap water...and a huge profit item for restaurants. If so, insist they serve you a bottled drink.