Pocket rocket fuel

I haven't used a canister stove in years but could get on average 17 12oz boils out of a 4oz canister with my gigapower. Not sure that helps a whole lot.

I've used the small MSR brand canister heating water for 8 days for dinner, maybe one breakfast. Mostly single serving Mt. House at 1.5 cups/meal. With the wind you say, be safe go with the larger size.
Duane
PS: That was with the old PR, I have not used my new MR but once a few weeks ago.

Some light and quick dinners that you can find in nearly any grocery store include:

Anything using pre-cooked pasta. Ramen noodles, etc. If unable to find pre-cooked pasta then just find very SMALL pasta, like angelhair or orzo or couscous. They cook faster.

Instant rice plus an instant soup packet for flavor is one of my favorite brainless dinners. I use instant miso soup packets. (Non-instant rice is a pain to cook in the field IMO.)

Instant mashed potatoes. Idahoan brand even makes 4-serving (i.e. about a full hiker meal) pouches suitable for "freezer-bag" style cooking. Add some other stuff for flavor and better nutrition. Doubt you can find Idahoan brand in Patagonia, though… :)

You probably CAN find Nestle Nido dried milk or something similar. Add it to your oatmeal for some calories and protein. I don't know about the rest of the world but Nido is pretty much the only dried milk brand commonly available in the US that's full fat rather than skim or low fat.

Hope that helps. Lots cheaper than specialty hiking meals.

I use the Soto OD-1R Micro Regulator Stove so this is not necessarily apples compared to apples but your fuel consumption will be in the ball park of what I will quote you. It is also fair to mention that I prefer Esbit over my alcohol and canister stove for weight and reliability reasons but will bring my Soto stove on occasion as a luxury item.

Jetboil/Jetpower fuel canister 100g specs: Total weight 7 oz. 3.5oz canister and 3.5oz fuel. I typically burn .5 oz of fuel to boil two cups of very cold water (~40*) with my stove wide open. This is without the optional Soto windscreen.

You obviously do not need two cups of water for oatmeal and the water does not need to come to a full boil unless you are sterilizing it. Throttling back on the stove may help milk an extra ounce or two from your canister. A pot cozy or wrapping your pot with other forms of insulation will help you conserve fuel as well.

I would stick with the manufacturers warnings with the windscreen. Use the natural terrain to protect your stove from the wind but don't use anything which may overheat your canister. I purchased the optional windscreen for my soto which weighs in at .7oz. I haven't used it enough to figure out if it will buy me an extra .7 oz of fuel from my canister or not but I like the way the stove performs with it so meh!

One is none. I've haven't had a canister failure yet but I wouldn't feel comfortable camping without some sort of backup. Esbit is only .5oz per tablet and I can boil two cups of water with it under ideal conditions. Just bring a small piece of foil and use rocks as your Esbit stove if necessary. If you want to forgo the Esbit or extra canister, make sure the food you are bringing can be readily consumed without the stove.