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I am interested in using a pulley for my foodrope

May a suggest you get two pulleys, and that the two pulleys have multiple wheels. A single pulley will privde you with no mechanical advatage (it just changes the direction of the force being applied).  You need multiple pulleys to obtain a mechanical advantage.

The system for creating your ropes   (You need to Login or Register allows you to configure your ropes in a manner similar to how DB does it, but also gives you the option of using an alternate method that I find makes it easier to raise the pack and allows the food pack to be a few feet higher off the ground, given the same sized trees (sometimes important where the hanging options are limited). The two double pulleys provide a 3-1 mechanical advantage.