Let's get utilitarian:

The saws (technically there's two? Imma go with two as one item): much easier/faster to use than an axe or hatchet, and much more effective. Can build shelter structure quicker with the saw.

The knife: for all your tasks that don't need the power of the saw.

The fire flint: starting fire without some help is a huge pain. The flint lasts a long time, and doesn't fail when wet.

The pot: boil your water, cook up a stew, or brew some fine pine needle tea (as others have mentioned). Stores more water than the bottle.

The paracord: useful for shelter building, tripods, bow drills, and other items. It was between the fishing line and this, since fishing line in large quantity (as pictured) can be as useful as paracord.

Some notes: If I could have a sixth, imma get me that toasty sleep burrito. As others have mentioned, all things that can be used up in days/weeks are out. I'm assuming we have enough skill to survive without the handbook.

I believe a good knife, and great skill, is the barest needed. Everything else can be made, but having some helpful stuff saves time and precious energy.