Portable water bottle easily brewing liquid additive

The invention provides a portable water bottle easily brewing a liquid additive. The portable water bottle comprises a water bottle body and also comprises an inner bottle body, a piston block and a pressing rod, wherein the inner bottle body is arranged in a bottle body and is connected with the bottle body in a screwed way, the piston block is tightly matched and sheathed in the inner bottle body in a way that the piston block can slide up and down along the inner bottle body, the pressing rod is vertically arranged, the lower end of the pressing rod passes through the piston block to the interior of the inner bottle body, the upper end of the pressing rod extends out the inner bottle body, the piston block and the pressing rod are sheathed, fixed and matched with each other, a liquid outlet hole through which the lower end of the pressing rod can movably pass is formed in the bottom surface of the inner bottle body, the liquid outlet hole corresponds to the end part of the lower end of the pressing rod in