Well I bit the bullet, and bought some more stuff I needed for the BOB. I got myself a great water filter from amazon.com and bought some items for the first aid kit and 5 days worth of dehydrated Mountain House food. I also grabbed some survival rations, and a wind up radio/flashlight kit for short $.
The water filter removes cryptosproidium, and it's filter is good for 200 gallons or so. I was going to buy the "upgraded model" but all it adds is a ceramic disk and a carbon filter for better taste... more stuff to break and more stuff to have extras of. this model is only 11oz. and can connect directly to the water backpack thingy I got from Coleman. Down the road I'll be getting a replacement filter, but 200 gallons should be good for a while. Better to put $ into other areas.
The survival rations are for the core bag. It's 3days worth of food in a vacuum sealed pack good for 5 years. The dehydrated food will go in the BOB. When I get some more $ to spend I'll buy another weeks worth or so and keep it in the bigger BOB. Down the road I'll probably get some of the #10 cans for the house in case I get to bug out with my truck, and they last 35 years rather than 7.
The wind up radio and light will go in the bigger BOB. I need to split the messkit I got into 2 parts, one for the BOB the rest into the Bigger BOB.