You are correct, recipe for Strong 5% Solution from page 583 of the Cure For All Disease:
The recipe to make 1 liter (quart) is:
44 gm (1Ĺ ounces) iodine, granular
88 gm (3 ounces) potassium iodide, granular
Dissolve the potassium Iodide
in about a pint of the water.
Then add the Iodine
crystals and fill to the liter mark with water.
It takes about 1 day to dissolve completely. Shake it from time to
time. Keep out of sight and reach of children. Do not use if
allergic to iodine. Be careful to avoid bottled water for preparation.