Read through your article and I've a few comments.
Hand winch - the one illustrated will be useless, they just collapse, the length of pull is much too short, a Tirfor style is a far better option, has longer levers, longer cable, etc, etc.
Puncture repair kits - a bicycle pump??? you'd be a dried skeleton before you could pump a modern tubeless tyre back onto its wheel bead. That said I have always fitted tubes to tyres on the assumption that sooner or later a puncture happens and with a tube you can fix punctures easliy and reseat the tyre onto the bead. BTW a jack can be used to break the bead, but you'd need a good set of loooooong tyre levers to remove a modern tyre from its wheel. Some liquid soap is always handy here.
Tyre lug - plus a length of steel pipe to give greater leverage - 1 metre does the job nicely.
Spare belts - know beforehand how to change them, I've been working on a Merc this week and to change the power steering belt you have to remove a lot more than a few spanners can cope with. I'd be more inclined to leave the belts at home and carry some universal radiator hose lengths.
Oil and Filters - if you get a hole in something, you need to plug it. Plastic metal, thick epoxy and a few pieces of alloy or even coins will help out in a really tight situation.
Water is water, just dont waste drinking water on an engine that is rooted.
Some sturdy wooden blocks to put a jack on is a must, if you are in sand/mud then the blocks need to be wide to distribute the weight of the jack. I've seen hilifts sink into the ground.