A duvet as loo roll? Sounds like my student days! 
I think thats the bit I find the hardest with the outdoors... the whole bathroom thing. As you say Mick, with the diet you're on over the weekend, thats not going to be making bathroom time any easier... but then thats all part of the challenge.
If the duvet is dry though... you could take the inners out so you've got some insulation for sleeping on, and the outer... charcloth? Loo roll? Water filter?

I think thats the bit I find the hardest with the outdoors... the whole bathroom thing. As you say Mick, with the diet you're on over the weekend, thats not going to be making bathroom time any easier... but then thats all part of the challenge.
If the duvet is dry though... you could take the inners out so you've got some insulation for sleeping on, and the outer... charcloth? Loo roll? Water filter?