mabli wrote:I drank two glasses of water before I left yesterday and had 2 litres of water on the walk although I didnt feel thirsty. When I got back I was parched, even had to get up several times to drink in the night... will be a it difficult to carry 4 litres of water on Sunday but I clearly need it.
Simples. Cotswolds sell dehydrated water, it's there between the sleeping bags and camping food section in the Betws store. You just rip open the sachet, add water and mix.
Anyway. Thirst is generally a poor indicator of hydration. By the time we become thirsty, we are already dehydrated, and drinking to quench thirst will not sufficiently redress that. We do not only lose water through sweat, but as we breathe, so we can't really rely on how whiffy our pits are either. However, the answer lies in wee. The volume, frequency, colour, odour and taste of urine/urination provides a better approximation of your fluid balance. Water is only one half of the story though - electrolyte balance is equally important, although less of an issue in these circumstances provided you also eat frequently.
Water is a dilemma: The more likely you are to dehydrate, the more water you carry, the more water you carry, the more weight you carry, and the more you dehydrate in doing so.
The only way round this is to source your water on the hill. If you have to carry a set volume of water, then this is not an option. But otherwise, one solution is to have a small water bottle as reserve and then to collect water from streams in a 2L platypus bag or similar and making it safe to drink.
This is not about constructing solar stills, evapo-transpiration trap bags, Indian wells or condoms in socks or any of that Ray Mears stuff, but common sense stuff. Identify water features on your route map that will allow you to collect up to a litre an hour if needed. Check the stream (streams are better, generally speaking, than ponds, lakes or bogs, faster flowing ones best of all) is fairly clear, has no dead or dying animals visible upstream for as far as the eye can see, no preponderance of shite, algae or discolouration and collect your water.
But for all this care, ALWAYS bung in disinfectant tablets as directed. They've stopped selling the iodine based tablets in the EU now so you'd have to use chlorine based ones such as puritabs or iodine tinctures. If you bung in a vitamin C tablet to take away the taste of iodine, make sure to rinse the container well before taking the water from the next stream.
There are other options ranging from boiling (a rolling boil is sufficient, contrary to dated assumptions) to Millbank bags or high tech ones like katadyn filters, filter straws or miox purifiers or even UV light based systems such as SteriPEN which are gaining credibility as it also kills Giardia and Crypto effectively which chemical systems struggle with. I remain sceptical of them all. Also, they are all either time consuming for the person on the go and best suited for camp or really expensive as an initial outlay at least.
Some people will suggest not to bother with making the water safe. Some may say that your means of disinfection adds weight, and that most waterborne pathogens have a longer incubation period than it takes to complete such an event. I've heard people say there is nothing lethal in the water (e.g. cholera) here, blindly ignorant of the risks posed by leptospirosis or E. coli O157.
These people are eventually cured of these delusions fairly easily with a solid dose of giardia, crypto or campy from minging water. It's not so much the bottom falling out of your world as the world falling out of your bottom. BTDT.