I’m not sure a mattress on the floor needs to be secured… I typically have a futon sofa/bed, that I secure at the bottom back corners using rope.
hmmm… technologies… where to start… Okay, to start with I want an empty counter top without a built in sink or stove. This makes it multi-functional. How I create that counter top depends on what is readily available, and whether I want drawers, cabinets, or both. I’ve used buffet’s, sideboards, credenza’s, a sliding door record cabinet, dressers, and plastic drawers with a wood shelf on top. I’ve also done rope hung shelves to create counter space.
I use rectangular plastic dish pans for sinks, and typical trigger spray bottles for water delivery. Any type of portable camp stove can work. I’m using $6 DIY veggie oil powered liquid candle type heater/cookers, which can also be used for cooling. By adding a heat powered fan, you can have fan forced heating/cooling which requires no battery or elecrical power. They can use multiple fuels too, veggie oil, diesel, kerosene, lamp oil etc. So your kitchen can be used indoors or outdoors without duplication.
My fridge/freezer and hot water are all fuel powered too. Fuel is cheaper and more reliable than battery power. One $8.00 gallon of veggie oil will power everything except my phone & laptop for over a month.
I’m using Luminiser & Stove Lite lanterns for much of my lighting, turning liquid fuel candles into bright LED lighting. I also have solar powered lanterns and and repurposed garden lights, that can recharge sitting in a window. Even my bug zapper is solar powered.
I have a single 100ah deep cycle battery, charged while driving or via my WWII era multi fuel/solar powered 3500w stirling engine powered generator. Nearly silent, and the only exhaust is from a liquid candle. It will run for many hours on just a few ounces of fuel.
I will run out of food or water long before my off grid systems will fail. I always strive towards a stress & worry free life, while living in comfort, convenience, & reliability.