Survival Tabs are a multi vitamen,mineral etc supplement in a decent container that can double as a small canteen. IS there a second purpose for the bleach, given you have iodine tablets? Are you aware of iodine's potential danger to some people with thyroid conditions? You may wish to upgrade your water purification later. Blue tarps, if you have the hardeware store drop cloth genre are heavier, noisier and less tearproof than siltarps etc. That is not to say they won't work. Julia Butterfly Hill's tiny treehouse was covered with blue tarps and survied El Nino. Tube tents are reviewed by Doug on the mainpage. You may want to consider an upgrade to a single quality tarp and retire the tube and blue. I see no stove or external heat source. You might consider a TP and coffee can stove to warm the vehicle, an ESBIT stove at minimum and some premade tinder ie petroleum soaked cotton balls and a small bag ofcommercially sold fatwood. It's silly to have the means to make a fire and no readily on hand fuel. What is your clothing? I would toss in a few knitted watch caps, work gloves and wool socks (feet and impromtu mittens) A few inepensive S/S Mora knives and a small sharpening diamond disbursed among the units would be a nice addition. Finally, a good first aid manual and basic survival guide in case your incapacitated and a untrained 2nd party has to take over.