i have 2 ways which have been effective for me all along
1. drink 9 mouthfuls of water
must be 9 at least.....no less
and must be continuous
if halfway u get interrupted by a hiccup, start over
2. hold ur breath and recite "Jing Ye Si"
chuang qian ming yue guang
yi shi di shang shuang
ju tou wang ming yue
di tou si gu xiang
(maybe other poems oso can, but this one easiest lah)