While Zombie Defense Solutions cannot account for what will happen to you on Day 4, they do promise that during Days 1 through 3 their all-inclusive kits will equip you to survive the harshest of apocalyptic conditions. Each includes 72 hours' worth of the following, enough to sustain 1 person:

Water. Purified drinking water in 6, triple-layered retort pouches that each hold 4.227 fl. oz.
Food. A 3,600-calorie energy bar scored into 9, 400-calorie portions. Packaged to ensure balanced nutritional values.
Lighting. 1 box of waterproof matches and 3, 6" lightsticks with lanyard hole and hook. Instant light at your fingertips, and each stick burns for 12 hours.
Warmth. The Kit's Mylar emergency blanket is waterproof, reflective, and retains up to 90% of body heat for both warming and cooling the human it shrouds. Folds compactly, but measures 84" x 52" when unraveled.
First Aid. A basic first aid kit contains: 7 bandages; 2 gauze pads; 2 alcohol prep pads; 2 wet naps; and 1 tube of triple antibiotic ointment.
Tools. 1 emergency hammer that can shatter glass and has a built-in seatbelt cutter. 1 survival bracelet with built-in whistle and 10 feet of nylon cord.