Problem here is compact. If you want 30 plants youll need a lot of amendments. I use 1 cup of kelp, neem, powdered malted barley and crab meal. 1/2 cup gypsum. 5-6cups of rock dust per cubic foot of compost. And 1 cuft of that compost makes 3cuft of soil. Now this is all based off of using good compost. If you use killer compost you can lower amounts of the inputs and maybe even get rid of them all.
So if you find a good spot. Somewhere humans havnt been kinda deal. The soil should be amazing. Check out the life around. If everything is healthy then that means the soil is alive and healthy. (Where I work there are oilfeilds and everything dies fast around those areas so make sure you check) so for this you could choose two things. Pots or planting in the ground. Since your carrying stuff you can take smart pots. If you plant in the ground i would not disturb the soil at all.... seeing as thats what were trying to achieve inside. Soil that has been undisturbed for many many years.
Plant right in the soil here. Topdress with some kelp, neem, and malted barley and maybe water in aloe powder since thats easy to carry. And if you have that good spot you dont need as many amendments. For teas you can make small bottles of water into teas to carry there and up there have a rain catch or some sort of water that you will dilute with. Also Keep up on your ipm. Once a week Spray neem, hemp, karanja, jojoba oil, ohn, whatever you use. Just make sure you do it every week:)
You can also forage basicly everything you need. Alfalfa, clover, nettle, yarrow etc. Then you dont even need to carry amendments