Ok, honestly, what "essentials" are you really desperate to put into your shopping trolley when you're allowed out...

@curiosi You had best try to find a zero water pitcher.

@4meAndyou It' doesn't filter out the fluoride which is the biggest problem for me.

@curiosi Ah. I understand. I assume distilled water would not work either for that reason. In my area we have spring water "filling stations", where you can refill your own gallon jugs.

What I would do if I were you is contact your local grocery store manager, explain your situation, and ask him if some can be kept aside for you for medical reasons.

@4meAndyou No one believes that you can be allergic to fluoride.

@curiosi If your doctor believes you, then contact him and ask him to write you a doctor's note.