Read
Review this information on carbon monoxide detectors and carbon monoxide exposure. Indoor Air Quality (under construction) page and EMF handout (under construction).
Water Filtration
For drinking: See water filtration/parasite and protozoa prevention guide
For drinking: check contaminants in your local water supply through EWG’s database (enter zip code)
For Bathing: Consider charcoal type filter to remove chlorine/chloramines. Here is one example. (I am not affiliated with company.) If you live in a city with chloramines (rather than just chlorine) in your water, make sure the shower filter you purchase will filter chloramines and not just chlorine (with Aquasana, simply ask for the "chloramines upgrade").
Whole house water flitration from Aquasana: https://www.aquasana.com/whole-house-water-filters