Asklemmy

Sharpening stones and files. I can't imagine using dull knives. I can't stand knives duller than hair popping sharp. I have excellent knives that hold a crisp edge and I sharpen those every 30 minutes of super fast chopping (10 seconds on a 9k stone).

Not just knives but scissors, trowels, shovels, cooking spatulas, dust pans, vegetable peelers, can openers, toenail clippers, all need to be sharp. Not being able to sharpen all of those would be a tragedy.

If you are delaying getting into sharpening, just do it. It will serve you for the rest of your life, and I sharpen every single day (I'm a woodworker). Its truly a luxury to have sharp tools, all the time. So satisfying.

Aside from that, chocolate. The cravings will never go away.

Air conditioning, but I would argue that is a very expensive necessity.

None that would "break me" if I didn't have them, but I spend the vast majority of my free time on my computer (by choice, I have friends and outside activities I can go to if I want), and whenever I've had to be away from it that's always been the toughest part.

Meat, specifically ground beef

Private Space. My own private Bedroom Especially. Also, a good bathroom. Especially a good toilet and shower. Make them clean too.

Healthcare, condoms

If there is a luxury whose absence would break you, then I would suggest you do a little "fast" from it, occasionally.

Chocolate.

Proper chocolate, not the shit that Cadbury turn out since it was bought by the cheese people.

No wonder they lost their royal warrant. That's the first thing that Charlie has done since the Prince's Trust that has really impressed me.