I have a simple philosophy "plan for everything". Or as close to everything as you can think of. Lack of planning is the door to death. Now I know it gets expensive thats why I cut corners when ever possible. Such as on non life dependant stuff buy military surplus I know ime gonna get beat down again for saying that but I don't care! the stuff is there its perfectly usable with life left in it, and most impotently its cheap. This allows you to keep a little more of your hard earned money, to spend on more varied supplies. Ime not saying buy stuff like gasmask from surplus. but things like clothes Back packs tents stuff like that. Essentially before you buy ask yourself if your life would be over if this item failed such as a gas mask. if the answer is yes buy new with warranty. If the answer is no buy cheap surplus.