The subject of mold-free housing after an exposure is very common. Many people spend countless hours and hundreds, even thousands of dollars searching for apartments, condos and homes only to have them test very high with mold tests and ERMI's.
I wouldn't suggest embarking on building your own tiny home or modular if you don't know how to build it "moisture-free", however if you have the skills to build your own and understand building biology and how to make it moisture-resistant it can be a very economical way to get yourself into a good place for healing. Here are some very cool tiny home and modular kits that are able to be purchased online and delivered to your site in a short time.
Lillevilla Allwood Cabin Kit Getaway $19,000
Getaway cabin kit
Inside Combined Floor Area: 292 Sqf + the sleeping Loft (not part of the 292 Sqf)