Here's a formula for alcohol fuel:
.065 liters per day of alcohol
.065 liters (x) 35 days = 2.275 liters
(rounded down) 2.25 liters
So - - - that works out to (ruffly) 4.9 pounds of fuel on day one, starting at the trail head.
Two plastic soda bottles for storage should weigh in at no more than 3.8 oz.
There are a lot of really good alcohol solo cook systems allowing for high efficiency. So, I'm not to concerned what stove. But, the numbers above are pretty accurate from my experience. You might be able to round down a little bit, but it would make me nervous to shave to much.
The above is for 2x hot drinks per day, and 2x hot meals per day.