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Vomiting can quickly lead to dehydration, so keep yourself hydrated by drinking 8-10 glasses of water throughout the day. Stay on a regular schedule and take sips of water every 15 minutes while you're actively vomiting. However, drinking too quickly could cause more vomiting, so take small sips instead of large gulps.  Ice-cold drinks are much more soothing to the stomach than lukewarm or hot drinks. Keep your water or juice in the refrigerator so it's cold when you drink it. If plain water is making you nauseous, try squeezing some lemon juice into it for flavor.  Sometimes sugary drinks like soda are more soothing for your stomach. Try drinking some ginger ale if water is making you nauseous. Sometimes drinking liquids can cause more vomiting. Sucking on an ice cube releases water slowly, which keeps you hydrated and avoids triggering further nausea. Don't bite down on the ice cubes. This could damage your teeth and also make you swallow too much water at once. If you've been vomiting for several hours, then your body is probably low on electrolytes, sodium, and other nutrients. Replace these by switching from water to sports drinks for a little while. These drinks provide electrolytes so you don't get dehydrated further.  Products like Pedialyte are also good for replenishing nutrients. Follow the same rules that you used for drinking water. Make sure the drink is cold and drink it slowly to avoid overfilling your stomach. You need to replenish lost nutrients from vomiting, but be careful about what you eat to prevent more nausea. Plain or bland foods are best. Good options are crackers, toast, potatoes, and rice. Bananas and applesauce are also good options that usually don't upset your stomach. Eat as much as you can tolerate to replenish lost nutrients.  Watery foods like broth or soup are good as well because they keep you hydrated. Avoid greasy and spicy foods, fast food, fried foods, and overly sweet foods. Dairy products can also make nausea worse. Too much food on your stomach may trigger more nausea and vomiting. Try to nibble on smaller meals throughout the day, rather than eating large meals. Eat slowly and don’t force yourself to eat too much at once.  Try to have 5 smaller meals instead of 3 large ones. Even if you have no appetite, try to have little snacks. This prevents further problems from a lack of nutrients.
Drink 8-10 glasses of water to prevent dehydration. Suck on an ice cube if you can't keep liquids down. Have sports drinks if you've been vomiting for a long time. Eat bland foods to prevent further vomiting. Have small meals to avoid being too full.