small rocket stove and coiled copper piping, you can heat and pump all the hot water you will ever need without electricity. I agree with Ron Marlett as I have seen a similar hot shower concept here in Africa Bosveldt. This is worth looking in to.
Survival cement, or cob as it is traditionally known has been used for of years for building. It is made by mixing mud (the higher clay content the better), dry grass or straw and water together. You can then use it as a cement to repair walls or.