To provide a drinking-water bottle generating hydrogen gas.

A cap 2 is removed from a bottle, and a water-impermeable seal 7 pasted on a rear face ceiling part 3 of the cap 2 is peeled by nipping a peeling piece 8 by fingers or the like. Thereafter, the cap 2 from which the water-impermeable seal 7 is peeled is fastened again onto the bottle 1, and the bottle 1 is inverted vertically. Then, drinking water in the bottle 1 penetrates through a film or a nonwoven fabric 10 so as to have a contact with a hydrogen gas generation member 4, and to thereby generate hydrogen gas, as shown in figure 4. The generated hydrogen gas penetrates through the film or the nonwoven fabric 10 and diffuses into the bottle 1.