Reverse osmosis filter is a must for everyone that has their own place.

If you're like me and you move around a lot, it's a bit more challenging - you'll often have to settle for "better" rather than "perfect". Just do the best you can.

I usually look for the highest quality water I can find at the grocery store, (in glass bottles if possible, as those plastic containers often sit for weeks/months leeching in lots of microplastics)