I got one of his 'SOS' kits, and threw it, a Ritter Kit, an Adventure Medical 0.5 FAK, and a Mora in a GI Butt pack and leave it in my truck. I don't dare keep anything more elaborate there, but it makes for a pretty neat and compact little set up. All in all, less than $100.00, and in a beat up old GI bag, not too theft prone -- so far. So far nobody seems to want to steal water.
I pilfered the mirror out of the Ward kit for another use, and put in a G2 for light. My truck has been broekn into twice, and I don't keep much in it, but I think that this set up is a pretty good compromise.
His pet gel fire packs do work, so long as you have an open flame to light them with. If you tear the corner off the foil pack, they can burn a long, long time as a sort of hot candle.