‘Chemical’ is not a bad word.
In fact, everything you can see, breathe, smell, taste, or touch, including the human body, is made up entirely of chemicals! This means trying to “avoid chemicals” is impossible!
What you probably DO want to avoid, though, is exposure to harmful chemicals in quantities that are likely to negatively affect your health. These chemicals (which include metals/metalloids, antimicrobials, microplastics, mycotoxins, and pesticides) can contaminate food and water, with the sources of contamination including the environment, agricultural practices, industrial waste, food packaging, and even cooking practices!
For an in-depth review on the topic, click through to check out Thompson and Darwish's 2019 study in the 𝐽𝑜𝑢𝑟𝑛𝑎𝑙 𝑜𝑓 𝑇𝑜𝑥𝑖𝑐𝑜𝑙𝑜𝑔𝑦.