Coca cola syrup is very good for nausea, We used it years ago when sick to calm a stomach. Pharmacies used to have the syrup in prescription style bottles just for nausea.
I rarely drink soda anymore, but when I have an upset stomach, a coke is what I drink.
If you can't get the syrup, just use flat coke. That was Grandma's remedy.
That is so true. I have found over the years that nothing works quite as well.
When on a vacation in Leningrad (earlier and later, St. Petersburg) in 1991, I came ghastly ill after accidentally ingesting some tap water. I felt that just one Coke or Pepsi would give me relief, but, alas, none could be found in the neighborhood. I can remember just thinking about a cold cola drink. That's all I could think about.