How humid? South America? Florida? ;-) Food vaccing will help - a lot. So will adding oxygen absorbers, www.packitgourmet.com sells them - buy some, you won't regret it.
A good trick for meals with sharp sides (noodles, rice, etc) is to line the food vac bag with a clean white paper towel first, then drop the food in. The towel will blunt the edges. Just remove when you go to add hot water of course (and hey, you get a paper towel for dinner as well for cleanup!)
With all dehydrating storage in the freezer till trip time will buy you the longest storage time. And if you are worried about meat, consider carrying the extra weight and taking the shelf stable foil pouches instead. They have shelf lifes of 2-3 years and work well.
(And yes, Trail cooking is me!)