Hydration squirt bottle is a squirt bottle with a special plunger actuator collar that is pivotally attached to a special plunger and mechanically linked to a special barrel or container wherein rotation of the plunger actuator collar relative to the barrel causes the plunger to move laterally into a barrel in order to cause liquid stored inside the barrel to squirt out from a spout on a cap. This invention helps older people or any other types of people that have difficulty staying hydrated or drinking fluid by squirting the water or beverage into the person's mouth through positive pressure, without the need for the person to drink from a standard cup or glass by sucking water from the cup or glass. In best mode, the squirt bottle is calibrated to squirt the exact amount of 20 cubic centimeters of water or beverage into the person's mouth per every one complete rotation of the plunger actuator collar.