A bottle (3) used for a water emergency ration is made of high density polyethylene. The material of the bottle (3) is then stabilized with ultra-violet light. After the filling of the bottle (3), the latter is sterilized in overpressure conditions in a water bath (9) at 120oC during at least 10 minutes and cooled by means of compressed air (12). The body of the bottle (3) has an edge ratio equal to 1:0, 6:0.4 with all side round edges, the bottom (14) presenting a camber (20). Such a bottle (3) is completely undeformable and may be thrown into the water without damage from a height of 36 m, the water having a lifetime longer than 5 years.