Just like baking soda, if you drink too much salt water on an empty stomach you may suffer from side effects such as vomiting, nausea and stomach pain. You may experience these symptoms especially on an empty stomach as you can become dehydrated. If you are overly dehydrated you will likely feel these symptoms quicker than you would if you drank salt water on a full stomach. You can experience vomiting and nausea if you have drunk salt water or water containing too much baking soda. Neither salt water or baking soda is quicker than the other when making you feel nauseated. The key is to not overdo consumption of either salt water or baking soda water.