Hold old? Does he have a garden or space to plant trees? I think every prepper wants to be self sustainable. If you get some trees to plant, like avocado, orange, apple, etc They may not bear fruit right away but in a few years they should produce tons of food. If not a lot of space, go with smaller plants like strawberries, tomatoes, jalapeno. Sadly even strawberries haven't worked for me because my yard has tons of aphids and ants who farm them, just destroying tons of plants along with neighborhood racoons/possums/stray cats ravaging our property whenever at night. Maybe rain barrels to collect rainwater. Everyone needs food and water. Bic lighters or 400 packets of honey (amazon $150).