The general plan is anything that would disrupt the spasms of the diaphragm. Therefore, most remedies work for at least someone.
I do it simply by sitting quietly and meditating. I imagine a smooth wave of relaxation starting in my chest and slowly moving down. Invariably, hiccups are gone in one or two "hics". However, it requires one or two quiet minutes so it takes a little longer if I am doing something that requires concentration somewhere else, like driving.
If you do the work to get this method down, it is the best I have found. It doesn't require any other tools or implements and it works faster than any other method.
IIRC, the Guinness Book of World Records used to list the longest spell of hiccoughs at over 12 years, with tens of millions of "hics". People sent 60,000 suggestions for cures. The only one that worked was a prayer to St. Jude -- the patron saint of lost causes.
Good luck.