Summarize:

Fill a glass full of cold water, then slowly drink it until it’s gone. As you drink, try to hold your breath for as long as you can. Additionally, you might plug up your ears. This technique works best if your water is ice cold rather than just chilled. Add water to a glass until it’s half full. Then, lean over your glass and drink from the side farthest away from you, which will simulate drinking upside down. As another option, you can lie upside down off of your bed or couch, then carefully drink the water.  Stop every few sips to see if your hiccups have gone away. Be careful that you don’t accidentally breathe in the water or pour it into your nose. Take a spoon and fill it with white or brown sugar. Then, hold the spoon in your mouth for 5-10 seconds. Finally, swallow the sugar and take a big sip of water. If this doesn't work straight away, it's not a good idea to ingest spoonful after spoonful of sugar. Instead, switch to a different technique. Place a lemon wedge into your mouth. Then, either bite into the wedge and drink the juice, or suck on the wedge to get the juice. If the taste is too much for you, it’s okay to add a little sugar to the lemon wedge to sweeten it. The taste of the lemon juice causes a similar reaction to someone scaring you. Vinegar may help combat your hiccups, but you may find its smell and taste to be unpleasant. Since pickle juice contains vinegar, you can drink it instead. Take a few sips of pickle juice or put a few drops of it onto your tongue. Then, repeat as necessary until your hiccups are gone. All pickle juice contains vinegar, no matter the type of pickle. Scoop out a small spoonful of peanut butter, then place it onto your tongue. Hold it in place for 5-10 seconds to let it dissolve some. Then, swallow the peanut butter without chewing. Other nut butters like almond butter or Nutella can be substituted for the peanut butter, if you prefer.
Sip a glass of ice cold water through a straw. Drink from the far side of your glass or upside down. Take a spoonful of sugar. Bite or suck on a lemon wedge. Sip on pickle juice for an easy way to consume vinegar. Eat a spoonful of peanut butter.