That's something to consider. My cook system is 415g. Not terrible but it's a lot for a coffee and some eggs one morning. Especially if it's getting warmer.
Omeals.com has self heating meals (dinners and breakfasts). I tried the southwestern style chicken and the self heating part is convenient, not too sure about the taste. I have to try another flavor first to see if I can really recommend them beyond the convenience part of not needing to bring a stove and gas canister.
Otherwise, Mountain House has a blueberry granola that just needs cold water to rehydrate the milk. It's in my pack for big trips for those mornings that I just don't feel like boiling water.
Can't really help you with getting hot coffee without a stove.
This is where I'm going to struggle I bet. I've got limited time as I have a wedding I'll be rushing back from. Although maybe I could do this Horseshoe Meadows. Does it get filled up fast?
I rushed my acclimation last year (only one day/night at Horseshoe Meadows) and got sick after summiting Mt Langley and couldn't continue to Mt Whitney. Everyone is different, but If you don't spend some time between 8,000 and 10,000 feet for at least a day and night before, you're asking for trouble.
You're not the groom, are you?
If you are, hopefully you're bringing your bride on the honeymoon at 14,000 feet.