Ten days! Where do you tour that you need to carry ten days of food and water? That is quite a load. Personally I avoid going anywhere that I need to carry more than a couple days of water, but even in the desert south west I have seldom needed to go much over 24 hours between resupply. Sometimes I have avoided carrying a lot by doing an extra long day rather than carry another day of stuff. For off road touring I am willing to carry a bit more in places where water isn't available, but at some point it is no longer worth the load to me.

For me, I seldom am more than 24 hours between resupply points. So I carry only what I need to get to the next store with a little extra just in case. I do buy some things in boxes that are enough for several days so something like instant oatmeal is usually on hand.

FWIW, I really prefer to not use freeze dried meals as my backup food. I just eat whatever I have on those rare occasions that I get caught out longer than expected. In that fairly infrequent situation I really don't mind if I have to eat oatmeal or granola bars for dinner.