Salt is a natural antibiotic. You can take a level teaspoon daily in water. Colloidal Silver is great at killing bacteria in the gut also. Once you get it all killed then take lots of expensive multi-strain acidophilus which is the good bacteria which helps digestion and keeps out the bad bacteria.
Bacteria on your food is normally killed by stomach acid and if that is low then you need to take a hydrochloric acid pill with each meal, especially ones with animal protein.