Different people seem to tolerate different things... at different times.
It may well be that you tolerate magic mouthwash better. My MO prescribed a concotion that was compounded.... This thing still burns now... and I am back to eating regular food. This probably mean that there was something wrong with the formulation. (so that is a possibility too, and no I am not using it anymore). Stay away from spices, you will not taste it anyway. I also had problems with fruit incl tomatoes (acid) and berries (seeds!!). However, milk (vanilla shakes) was tolerated well even when some water burned (depending on the source!!). Also, rinsing with soda/salt was soothing. The other thing that would provide relief is viscous lidocain, especially if you take this prior to eating/drinking. (you need a prescription) It may allow you to use less pain killers. This saved my sanity for about 2 weeks. Watch out for constipation!

Hang in there, it will get better!

Markus