Abstract: A personal hydration system with a flow-restricting device. The hydration system includes a fluid reservoir configured to store fluid and a tube assembly that is coupled to the reservoir and configured to deliver fluid to a user's mouth, such as via a mouthpiece. The system further includes a flow-restricting device that is configured to selectively restrict the flow of drink fluid between the reservoir and the mouthpiece. In some embodiments, the flow-restricting device includes a body and a rotatable core.