Sleep

Water is generally healthiest to drink, but most tap water is contaminated with pharmaceuticals (including estrogenic contraception), agricultural runoff, and/or other industrial chemicals and metals. It's not just what you drink, either:

Showering produces respirable droplets that may serve to deposit pollutants such as trihalomethane decontamination products, heavy metals, inorganic salts, microbes, or cyanoacterial toxins within the respiratory tract.... in one study, the blood levels of trihalomethane were highest among individuals showering for 10 min, intermediate for individuals bathing for 10 min, and lowest among those who drank 1 L water from the same source over a 10-min period.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2874882

Avoid plastic;

Most plastic products, from sippy cups to food wraps, can release chemicals that act like the sex hormone estrogen, according to a study in Environmental Health Perspectives.
The study found these chemicals even in products that didn't contain BPA
https://www.npr.org/2011/03/02/134196209/study-most-plastics-leach-hormone-like-chemicals

Avoid harmful chemicals and dyes:

"I've been studying chemicals in the environment for a long time. Many of these chemicals come from the products that we buy and use in our daily lives, including our personal care products. Things like our shampoos, our perfumes, our lotions and our soaps. And we are increasingly finding out that some of these chemicals are bad for us in a variety of ways."
https://www.rutgers.edu/news/rutgers-researchers-study-how-personal-care-products-affect-our-health
PFAS are toxic and they're everywhere.
Most of the PFAS that make it into our bodies do it through drinking water...
PFAS came to notoriety in the 1940s, when manufacturers started using them in products such as non-stick cookware, stain-resistant fabrics, and water-repellent clothing. These days, you can also find these chemicals in some types of grease-repelling food packaging, waterproof cosmetics, carpets, furniture, and take-out containers....In 2021, researchers from various universities tested 231 makeup products and found that more than half of them were likely to have PFAS.
https://www.popsci.com/diy/how-to-avoid-pfas
Exposure to chemicals used in nonstick cookware and long-lasting makeup has been linked to elevated liver-cancer risk, researchers at the University of Southern California found.
https://www.insider.com/study-confirms-link-between-forever-chemicals-and-liver-cancer-risk-2022-8