Definitely get rid of the bottle and go wherever you feel like going.
Reminds me of how a buddy of mine used to take a bottle of Mt.Dew with him to his stand along with another empty Mt. Dew bottle for relieving himself. Well, he got up into his stand and had to pee right then. So, he used the empty bottle to "go" in and then put it back in his pack.
Later, he got thirsty and grabbed his Mt. Dew out of his pack and guess what! You're right! He grabbed the wrong bottle and took a big swig before he realized he grabbed the wrong one! True story.
We always tease him about how, if that happened to one of us, we sure never would've told anyone about it!