Yes, if organic pollutants are the only issue. Under ideal conditions, water is sufficient to make tap water drinkable, provided it is not contaminated with pollutants such as pesticides and herbicides. Suppose the water in your town has been contaminated by a natural disaster, chemical spills, or industrial farming. In that case, you will need to filter and boil it to eliminate the toxins. Similarly, if you get your water from a lake or river, boiling it can kill viruses, but it may still be unsafe to drink if it contains heavy metals and other contaminants. So, before the water is drinkable, it must be boiled and filtered.