I would also recommend keeping the wool blanket. If it gets wet it can still keep you warm. As far as the food goes you might want to consider if others will be driving or riding in your vehicle. I keep Snickers Marathon bars in the car. They have a lot of protein, 300 calories and taste just like a Snickers bar. Especially great if you have kids. The only down side is that they will melt fairly easily in the heat.