Let's say you're in a Tom Hanks situation like in his movie, Cast Away. What would you pick for a survival kit where you are stranded on a deserted island for an extended period of time? You have the following limitations:

1. The survival kit must be in a container (backpack, fanny pack, etc).

2. The whole survival kit (container, food, water, etc) has a maximum weight of 25 pounds.

3. Your maximum budget for the survival kit is 300 dollars.