Grow your own food whenever possible. Make friends with traditional farmers and ranchers and butchers. You should have been doing this 50 years ago. Get you seeds from well known heirloom sources or very local "seed banks". Lot of small towns libraries have a "seed library" for locally grown and handled seeds. Spoiler alert for everyone that actually cooks their food rather than eating out all of the time. This will first come to fast food. The people that eat that all of the time are already used to their food being shit and think its good. It will be easy to get them to eat it even if it tastes worse because of this garbage. People that cook their own food will notice quickly and stop buying it.