Best type of water for medicine stock solution

Hey Discus People,

Just wondering what you think is the best type of water to mix with medications for the creation of stock solutions?
Mostly, I have encountered medications being mixed with distilled water. Distilled water has 0 TDS, therefore dry powders/crystals of medicines dissolve more easily.
In my medical arsenal, I like to keep powder/crystals of Acriflavine, Malachite Green and Methylene Blue.

Please share your thoughts.

Sterile distilled water.

From a practical perspective, there's no difference in the type of water used. As long as the chemical is dissolved, the efficacy is the same.