It should be said that there is a difference between preparing for the collapse and live there after and just purchasing supplies as to insulate yourself from consequences of collapse. If you dont have a garden in your preps than i dont think you’re really prepping.
The survival podcast, one of the most popular prepper podcast has aquaponics system on all the time. Permaculture and prepping go really well together. That being said many preppers are just hoarders and will someday be desperate when their stockpiles run down.