I remember well how acute my sense of smell was (it is anyway).
All I can suggest is bathing, as much as you like. It's also a gentle way to take in water, when you can't "stomach" it. For me, a bath does wonders. Always. (and then there's EFT: "even though I feel..." that's always helped me weather some of the rough patches in water fasting)The only time the bath hasn't helped though, I knew I was in trouble: that one time it turned out to be a serious illness. (meningeoccal pneumonia). But have no fear. If you don't have a filter for the bath, do what I do and run the water very hot, then let it gas off the chlorine, before you take it.