Best DIY Projects for Off-Grid Survival?

[MarigoldBreeze]

Just finished building a rainwater collection system from scratch, now looking for more off-grid DIY projects. Anybody got recommendations? Preferably something useful, not ultra complicated. Let's share ideas here.

 

[ChrysanthiDream]

Built a solar oven yet? Making one from an old satellite dish or even a cardboard box could be your next step.