I bring about 1/2 oz and that lasts about 6 days, and I'm sure that is not enough according to your information. However, since I'm not touching bathroom door handles, telephones, or other things that are normally found in the home or office enivironment I'm ok with the additional risk.....and I've never run into any swine with the swine flu in the wilderness.
Only once did I run into a rather ill looking hiker at buckskin pass on the maroon belles circuit, but carrying a huge 50lb pack up above 13K while being a good 20lbs overweight would make anyone a little green!
Oh, and if I drop food - 5 second rule. Sometimes, I'll even blow the dirt off before I eat it too, LOL.