You can preserve wild mushrooms by drying, freezing, and pickling. Use caution if you want to preserve wild mushrooms by canning. Bolete mushrooms (also known as porcini or cepes) are suitable for canning since thir texture is similar to button mushrooms.
Why adding Alum to your stockpile is important. Clarify dirty water in times of catastrophe. I've used powdered alum for years as a blood stop. It's in my emergency kit as well as my home medicine cabinet.