PURPOSE: To manufacture easily a portable potable-water pack containing no air at a place in a disaster area, etc., by stitching a belt-like material in the form of a cylinder in a casing, closing a bottom of the stitched material to form a preliminary package whose upper side is opened and sealing the package at a portion below a water feed position after feeding potable water into the package.

CONSTITUTION: A belt-like material 31 is unrolled from a material roll 32 contained in a portable type casing and is held and pressed by right and left rolls 33, 33 to be folded from both sides, and the both side edges are melted to be stitched together by a roller electrode 34 of a high-frequency sewing machine to form the folded material into a cylindrical shape. Further, a lower end thereof is melted and stitched by edges of plate-like electrodes 35, 35 of the high-frequency sewing machine to form a preliminary package having a bottom. Then, potable water is fed from above by a water feed nozzle 36, and the melted and stitched part is cut by a cutter 37 for cutting, which is provided at a lower portion of the casing, to form a portable potable-water pack. By this method, a potable water pack containing no air can be made without particularly using a deaerating means.