In some cities, tap water is drinkable. I personally prefer not to drink tap water, since it has gone through cleaning processes in a special purification center, and may have been manipulated.

No tap water, unless you have an osmosis filter, which range between $100 and $1000.

Yes. The Gredos mountain range in Spain. One of the points of the peninsula with the most water. I go to a natural source, which emanates directly from the river at the top of the mountain, and I collect it in special jugs. Remember that the higher up the mountain, the purer the water, although possibly fewer minerals. Minerals are obtained precisely by moving between rocks and soil, also rubbing against plants and even other animals. This is good, but unfortunately, there are also chemicals from some farms or cities if you drink water near these urban centers.

I force myself to drink water from a 1L thermos that I constantly refill. Super Sparrow (the thermos) accompanies me whenever I go out.

I 100% avoid chemicals in any food or drink. The more natural and direct from the field, without chemicals and pesticides, the better. And I am lucky to be able to get these products in my city: eggs, vegetables and fruits, even the little meat I eat is from livestock where they live free (not in cages).