Five things you could start this weekend. Ordinary tools, no specialist skills, and each one does something visible on the first day.
Solar cooker: A reflective box or dish that concentrates sunlight onto a dark cooking pot. The pot absorbs the light and heats up enough to cook food. It cooks for free, with — Why this one: Works the first sunny afternoon you try it.
Haybox / retained-heat cooker (fireless cooker): A heavily insulated box that a pot is put into after being brought to the boil. The heat already in the pot keeps it simmering for hours with no more fuel, and — Why this one: A box and some insulation. The physics does the rest and cooks for you.
Solar dryer (dehydration): A box where the sun warms air that then flows over trays of fruit, vegetables or herbs. The warm, moving air draws out their water, so mould and bacteria cannot — Why this one: Cheap to try, and the result are usable for months.
Bio-sand filter: A tall container filled with layers of sand and gravel that water is poured into and slowly passes through. A living layer of tiny organisms grows on top of the — Why this one: Easy and potentially life-saving in any crisis scenario.
Bokashi fermentation composting: Anaerobic fermentation in a sealed bin; handles cooked food/meat scraps that open composting struggles with. — Why this one: Fits under a sink, handles waste, and needs no garden.
This is a short list, not the whole catalogue
All the solutions for your home are in the catalogue, organized by need.