This custom was accompanied by strict rules. For example, male visitors ended up sleeping on one side of the bed, while the family’s daughters were on the other side. Source: Ekirch, A. Roger. At day’s close: night in times past. WW Norton & Company, 2006. ↩︎ I have sustained burns from hot water bottles when sleeping with them when drunk! It’s amazing how much damage they can do. I tend not to do that nowadays, and I also prefer bottles with covers as they are more comfortable to use and stay hotter longer. I have a couple which have amazing covers and actually stay warm all night and well into the next day, which is great if you are in bed with a cold or something. Look for bottles with protective features like a silicone sleeve or a powder coating that can help prevent scratches and dents. Even a slightly lower shower frequency easily provides you with the water and energy for continuous hot water bottle use. This is an often overlooked feature, but more important than you may think, and is a two-fold thing. Firstly, drinks stored in some plastic bottles tend not to taste as pure as drinks stored in metal. Secondly, certain drinks can leave their taste on the inside of certain bottles more easily than others. If you intend using your water bottle for coffee, tea and sports drinks, as well as water, then look for a bottle that doesn’t hold taste easily and is odourless. Capacity

Deng, Qihong, et al. “Human thermal sensation and comfort in a non-uniform environment with personalized heating.” Science of the total environment 578 (2017): 242-248. ↩︎Rinse your water bottle with clean water and dish soap after every use and allow it to dry completely. In the context of the energy crisis that we are fearing for this winter, I actually think that somewhat like you, can help a great deal of people in this situation. I’m trying to get other people to read your articles since you have written many articles about alternatives to the “normal” way of heating ourselves (or rather our buildings). I genuinly think that if some of your ideas spread, it might make a significant dent in our gas consumption (and costs of living!). I’m looking at making myself a window quilt for my appartement this winter, I think it would be great if you could get other people on board doing this! I imagine you could write an article on how to keep warm, the old fashioned way. Just a few thoughts: If you are using your water bottle for cooking at camp or you’re mixing energy drinks etc in your bottle then having measurements is a really useful feature. It’s also good if you need to monitor or ration your liquid intake when hiking. The Nalgene, Platypus and Primus bottles all feature volume measurements. Rubber base

As early as the 1500s, people started to use all kinds of portable containers filled with hot coals from the fire. These were used as foot warmers, hand warmers, and bed warmers. 3 Most were made of metal, either brass or copper, and placed inside wooden or ceramic enclosures to prevent skin burns. Over time, hot coals were replaced by hot water, which is a cleaner and safer heat storage medium.The feel of the bottle in my hands. Does it slip through my hands easily or is it nice and grippy? Is it too wide to easily hold with one hand?