I don't buy all that stuff. It's just more crap to haul into the woods. I do carry two 35mm film cannisters (watertight), and if I get to gut a deer, and he (or she) has urine left, I drain it into the cannisters. Then when I'm getting ready to go out, I cut the pee 50/50 with water and put it in a squirt bottle. I apply it after I've gotten in my stand, then squirt it on limbs, tree trunks, whatever, at about nose-level. Any that I might have left at the end of the season, I freeze for next year. It's not too high-tech, but it's cheap and good 'nuff for me.

Ain't had anything to gut? Stew a bunch of acorns and oak leaves and use the liquid. Keep it refrigerated, because it'll get moldy if you don't.