If you are looking to assemble a good survival kit, you will want it to be portable so that you have it with you wherever life or your adventures take you. You need it to have all of the essentials for survival and nothing more.
Have at least one gallon of water for yourself, a first aid kit, a few ready to eat meals or MREs, and a cell phone with a charger. Have a flashlight, a small radio, and batteries handy and also any medications you need. Assemble them in a tactical backpack with compartments.