Generally speaking, the more outdoor experience you have, the fewer items you’ll need in your survival kit. Those who are quite skilled at starting campfires may not need to bring matches and emergency tinder; as a simple fire starter will suffice. Similarly, experienced outdoor enthusiasts may elect to bring items like garbage bags, rather than ponchos, as they can be used for a variety of different purposes, which outdoor novices are unlikely to have mastered.
In the beginning, you might decide to buy food a bit at a time when you make your weekly trip to the grocery store. If you think your budget is just too tight to spend extra money building your reserves, consider this: Skipping the morning latte or the on-the-go-breakfast at the drive-thru can save you $100 a month if you're only spending $5 a day, five days a week. That's about $1,200 a year—plenty to get your emergency supply built up and invest in essential equipment and gear.