Well, no food means we have taken care of the problem of poisons sprayed on foods. The different types of chemicals used in agriculture are: Herbicides (To kill weeds) Insecticides: (To kill bugs) Fungicides: (To get rid of disease) Soil fumigants, desiccants, harvest aids, and plant growth regulators. Or we could try the Amish way - https://duckduckgo.com/?t=ffab&q=amish+wheat+harvesting&iax=images&ia=images.