During heat waves, power outages, or emergencies, having a clean, reliable supply can make a huge difference. The good news? You don't have to rely on store shelves or bottled supplies.

Eat them as a side or follow our easy recipes for a tasty salad or an oven-baked frittata. To make the roasted vegetables, preheat the oven to 220C/200C Fan/Gas 7. Divide the vegetables between ...