One of the most vital things to remember when it comes to eating when you have an nausea, is what not to eat. It is always best to avoid all foods that are particularly greasy or sweet, and especially fried foods.
Bear in mind dehydration is always a concern when it comes to illness, whether the illness is the common cold or flu, or due to some other medical issue, but especially if your upset stomach involves vomiting or diarrhea. Staying hydrated is crucial because your body needs fluids to help flush out waste, bacteria or viruses that may be causing your upset stomach. Water, hot teas, and sports drinks can be choices, but if your nausea comes in conjection with any other symptoms that make it difficult to drink (such as a sore throat), popsicles are also a good way to keep hydrated without drinking fluids.
Teas are an especially great option, especially if you use herbal knowledge to brew varities that have properties to soothe an upset stomach. Fennel and ginger are great choices, because fennel is a natural remedy for gas and stomach cramps, and ginger is a fabulous natural remedy to calm upset stomachs. Mint, cinnamon, and thyme also make great teas because they help move wastes out of the system. Of course, the warmth of the teas is always a welcome and comforting element. It is noteworthy that modern ginger ale has little, to no actual ginger in it, so unless you just enjoy drinking it when you're ill, it really isn't helping in this respect. However, the carbonation in modern ginger ale, and other sodas, is sometimes relaxing, so they might be a good choice provided they are non-caffeinated, as caffeine exaberbate an upset your stomach even more.
Solid foods can be difficult to chose from but options like clear soups, plain broths, or chicken noodle are always a good choice. Not only are they gentle on the system, but they're comforting, and help keep you feeling warm, even if you have a fever with your upset stomach. Other bland foods like apple sauce, watery jello in liquid form, oatmeal, bananas, saltine crackers, rice or boiled chicken are all unlikely to aggravate an upset stomach, so they are good foods to try.
If you find that the liquids or foods do not stay down, try a few ice chips in your mouth. Attempt more liquids and food in an hour or so again. There may be anti-nausea syrups you can try as well, found in over the counter, in your local drugstore. One such type syrup is actually a cola syrup.
Since everyone's body is different, what constitutes a good light meal, for your upset stomach might not set well for someone else. Because of this, it's important to trust your instincts, when it comes to any suggestions. It's also important to get plenty of rest and sleep while you are recovering, as your body is working hard to overcome.