be gritty in the mouth

This drink is gritty.

この飲み物は口の中がもさもさします

This drink is a little gritty.

この飲み物は少し口の中がもさもさします

This drink is a little grittier than usual.

この飲み物は普段より少し口の中がもさもさします

This drink is a little grittier than usual to me.

この飲み物は私には普段より少し口の中がもさもさします

This drink is a little grittier than usual to me because the powder hasn't dissolved properly.

粉が十分に溶けていないので、この飲み物は私には普段より少し口の中がもさもさします