Sources: Papers On Health
This is a matter of great importance to the sick.
Nor is anything more important to be said on them than this, that the
foundation of all such drinks must be water. This water must be
pure, and is best distilled, or boiled and filtered. Long boiling
will spoil water, and half-an-hour is long enough to boil. To add to
this pure water, we may take the juice of half a lemon, sweetened to
taste. Few patients will fail to relish this. A whole orange may be
used instead of half a lemon. A substitute may be made by taking
half-a-teaspoonful of good white vinegar instead of the orange or
lemon. Also in many cases where the cold drink is not relished, it may
be taken warm.