Bottle cap and bottle

The utility model discloses a bottle cap and a bottle. The bottle cap comprises a top cap and a lower cap; the top cap covers the top edge of the lower cap; the lower cap is cylindrical, and the periphery of the radial cross section of the lower cap is half-moon-shaped. The bottle comprises the bottle cap and a bottle body; the lower cap is arranged on the bottleneck of the bottle body. According to the utility model, the periphery of the radial cross section of the lower cap arranged on the bottleneck of the bottle body is of a half moon shape, which matches a mouth shape when one opens the mouth naturally; accordingly, one can drink water in a more comfortable way and does not need to open the mouth in a circular shape or align the mouth with part of the bottleneck.