no fukking chance you can go 50% from the 3 pt. line shooting 100 non stop 3 pointers ... sorry pal, your arms will be noodles after about 25 ... you are getting assraped by 1-1 odds...
I'm almost positive the milk and saltine challenges are physically impossible. I've seen videos of this and I dont think it can be done. Your arms will be dead after 50 three-pointers, so thats out. I don't think any sane person can go 5 days without sleeping under normal circumstances, which I wouldn't consider poker an emergency situation.
I think the only ones you'll be able to accomplish are the Free Throws and possibly the Tequila. Some people can drink tequila non-stop and be fine, but you won't know unless you try.