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From ten or twelve regulators (via mouthpieces and second stage interiors), we isolated three strains of E. coli; Clostridium; Salmonella; Bifidobacterium; Cryptosporidium; Staphylococcus; and the lovely Candida, the causative agent of genital yeast infections, and thrush.
OK, a mask; then, a regulator of your own, with an SPG. Computers can wait; tables are cheap and simple, at the very beginning. I was diving for well over a decade before I saw my first one -- and I still possess feeling in my hands and toes. Any regulator worth its weight, will comfortably fit in a day pack.
Having done bacterial tests on rental gear years ago, I wouldn't put my mouth on a rental regulator:
You can have ypur own mouthpiece and switchout with zipties. Lots cheaper in the beginning
The lion's share of contamination was internal . . .