Water. In some scenarios, food may be out of the question in a survival situation, but clean drinkable water is not. We need it to stay hydrated, mentally aware, as well as for first aid purposes. I prefer to carry water purification tablets. They are very small, light, non breakable, and work relatively quickly. If liquid water is not available I also keep tin foil folded up in the kit (about 4 square feet). This tin foil is to melt snow and ice over the fire prior to purifying with the tablets or boiling.
I also like to carry a small selection of bandaids, alcohol wipes, medical tape, lip balm and electrolyte tablets. These are here to provide help to any medical scenarios if I am separated from my first aid kit.
With these objects all nicely together in my plastic bag, I confidently know that I have what I need to survive in that worst case scenario moment! I hope this inspires you to build your own Personal Survival kit for all your outdoor adventures!
Have Fun and Get Outside!