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Prepare heat pack 30-40 minutes prior to use. Open wrapper and remove heat pack.
Activate heat pack by shaking gently.
Shake bottle. Remove lid and seal.
Replace lid loosely and microwave for 10 seconds. Tighten lid, shake bottle again. Allow the bottle to stand and wait for temperature strip to activate a green dot between 94°–100°F. Black indicates overheated bottle. Allow to cool until a green dot appears between 94°–100°F. Do NOT overheat bottle. It will melt.
If a microwave is unavailable, heat the bottle by attaching the heat pack 1+ hours before use.
Use a rubber band to attach the activated heat pack to the back of the bottle, which will maintain the temperature for up to five hours.
Shake bottle before pouring into cup.