Remember, it is absorbed into the blood stream through the pores.
Use extract of grapefruit seed. It is a biologically active natural ingredient found in the seeds which kills salmonella, e-coli, strep, staph, herpes, candida, influenza, parasites, fungi, traveler's diarrhea etc. Use it as an antibiotic, anti-fungal, anti viral, antiseptic and disinfectant.
If I went to a desert island, it would be the one thing I would take.
Hugs from Inquisitive