Honestly the question has the answer already, and people who said "don't" are right. Not because bitcoin is a bad investment, but if you can't afford to lose 100% of your investment, then do not invest into anything at all, because it shouldn't be an issue for you to invest and still live normally.

I personally invest money that I do not need in my regular life, which means if I lose 100%, tomorrow will be the same as today for me. Of course I would be very upset and sad, but being upset and being poorer are not the same thing. If you can't afford to lose 100%, then do not invest into anything, and try to figure out how much you can afford to lose 100% and invest that much.