Michelle drank about 5 gallons of the water. She then replaced the canteen back into her backpack once she had finished.
Michelle felt a itching feeling as her smooth skin was starting to turn a dark green not even five minutes after drinking the water, followed soon by a forked tongue and claws. Then seven minutes later she heard a ripping as her pants tore off revealing a lengthening, thick and heavy tail.
At the ten minute mark Michelle had a headache as her head shifted and warped, becoming much like a lizards while staying humanoid. While for the next five minutes, her body was bulking up and growing larger, straining and ripping the last of her clothes off.
Michelle could see herself in the reflection of the quiet, still lake that she was now 6'11" tall with 330 pounds of muscle and a well set pair of DD size breasts.
Michelle smiled, "That'ssss right, now what sssshould I do now?"