Yep its been discussed before but thats okay. People's opinions change and research, science, etc changes over time too. One of the great things about the people on this board is they rarely hand out stock "Do a search" answers that we all know can be quite frustrating to a newcomer. I alot of the guys and gals here will often post links to other threads with helpful information. This is probably the friendliest board I have ever been a part of!
I'll keep it real simple. Note: this is just my opinion. <img src="/images/graemlins/grin.gif" alt="" />
#1. Knife -- Absolutely no question about this one being most important IMHO. With a good knife, proper knowledge and lots of hands-on (practice) experience, I can improvise anything else I need including #2 and #3 from this list.
#2. Fire -- Some method (there are many) of starting fire. Lighter, matches, flint, etc.
#3. Water -- Some method (there are many) of obtaining clean drinking water. Water is the next most important thing to fire IMHO. If you're not already familiar with it, see "The Rule of 3's" for details on why I feel this way. <img src="/images/graemlins/smile.gif" alt="" /> If you have trouble finding info on the Rule of 3's, post a reply and I will dig up more info on it that you ever wanted or needed. <img src="/images/graemlins/smile.gif" alt="" />
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Learn to improvise everything.