For those of us with CIRS or MCS (or Toxic Injury or Chronic Fatigue Syndrome or Environmental Illness or mold toxicity or whatever you want to call it), sometimes camping helps. Sometimes camping helps A LOT (life changing).
Plus finding a good location to move to is easier with mobility. The first idea comes from a friend of mine, Bryan Rosner. He wrote a great book called Lyme Disease Supercharge. https://www.amazon.com/Lyme-Disease-Supercharge-Revolutionary-Approach-ebook/dp/B07P7NQXLN
The idea is to get a truck with a metal truck bed (with no truck bed liner) and add a metal truck bed topper. The genius is that not only does the metal not off-gas harmful chemicals, but it also decontaminates far easier than most materials. If you should run into mold or something, most toxins should wash off with just plain soap (or even maybe just plain water).
With a family, a sick parent could sleep in the truck while the rest camp in a tent or something that may not have worked as well for the sick one.
The second idea is a shed. Here are my recommendations:
Build up the ground so the shed will be on the highest part all around. Pack down firmly (Bobcat or something). Add 6 inches of gravel for a capillary break.
Wash all pieces of the shed (because they will have release oil on them).
Pour a small slab of plain concrete (no additives). Let cure AT LEAST 30 days. Longer if humid. However, this being an open shed with no wood, hubs just pointed out this longer cure time actually may not be necessary!
Put flashing at the bottom of the slab or be prepared for rainwater to come in under the shed walls (which is actually fine if you are not going to insulate or finish the inside unless the climate gets more than 18 inches of rain, and then it still might be fine).
Put up shed. Even if you are considering insulating, let it sit uninsulated until you are POSITIVE no rain will ever come in again. This might include caulking screws, etc. I really would recommend bare steel, no insulation and no finishing, though.
Increase the overhang or add gutters. If windy and high, increase the coverage of the apex of the roof.
If you want, tile the floor. If you tile the floor, it will be easier to clean of spills and VOCs.
Add a safe heater for chilly nights.
