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Be sure to include a Waterskin, Water Jar or Canteen with at least 25% water in the Cooking Pot, and remove any Charcoal during the cooking process to avoid the creation of any dyes. Thatch can also be used as a fuel, as it doesn't create any Charcoal byproducts which could accidentally produce dyes.
For more information, see Spoilage.
If you look closely, you will notice that the potent variant of the medical brew has less liquid inside