Depending on where you travel in the world, the water may or may not be safe to drink. The water may look clean, but there maybe be tiny microscopic bacteria and parasites that will maek you very sick. Think of Montezuma’s Revenge in Mexico. Even drinking water out of streams and lakes here in the US can may you sick.
You can try to obtain bottled water, or drink softdrinks. Be carefull about getting your drinks with ice, as the ice may have be made with contaminated water.
If you can’t get safe water, you will need to purify it in some way. Boiling the water is the safest solution. Just bring the water to a full rolling boil for one full minute.
Another solution is to use Iodine tablets. I recent did a trail run through the Adirondacks where I need to replenish my water bottles from streams. There are some nasty bugs in those streams including one called Beaver Fever. I used a product named Potable Aqua. If was a 2 part water purifier. The first tablet was iodine, which I needed to leave in the water for at least 30 minutes. This turned the water kind yellow/brown. Then I added a second tablet which would nullify the iodine. It also made the water clear again. The water didn’t taste half bad. The tablets came in a couple small bottles. Each tablet is good for 16 ounces of water.
There are also some tablets you can get that contain chlorine. I have read mixed reviews of these, mostly regarding taste. But probably like tap water, if you let the water sit, the chlorine will likely evaporate.
If the water is especially dirty, you may need to let the water purifying tablets work longer. Just be sure to follow the directions on the packages.