3 liters? heck of a lot of sodium in one day, may not be good for some people.
True - But for a short-term sickness emergency, particularly for persons without other options, “3 liters Tonic Water” is generally:
1) Easily remembered and spelled
2) Non prescription/Non doctor necessary
3) Generally available and
4) Cheap
The “3 liter tonic water” is not ideal, but it is a method to get HCQ quinine into a sick person with no other options quickly.