Thanks mousey, i think your about right there, next time out i will try 4ltr carry, also about the gressy food i do tend to have a fried breakfast, sausage mushrooms and bacon, it keeps me going until tea time (kebabs) i could try another options from now on like porage, and boiled food, rice pasta etc, well there is another thread for later.I go with 2 litres per day, this does me drinking, cooking and pot washing [I do tend to lick the bowl clean first though] so for 2 days 4 litres is good for me - if it looks like I'm not going to be able to re-fill then I can push 4 litres to 3 days but I get a bit thirsty toward the end. I don't like to carry more than 4 litres as it starts to get a bit heavy...
I use pop bottles, good rinse and I can't taste any of the previous content or plastic - although I suspect I haven't got the most sensitive of tastebuds.
Thanks all for your helpful replies
Bill