Drinking mold can cause health issues such as nausea, vomiting, diarrhea, headaches, and skin rashes. The type of mold ingested and the individuals immune system can affect the severity of the symptoms. People prone to allergies might experience more symptoms if they drink moldy water. Long-term mold exposure can cause digestive issues, such as diarrhea, vomiting, or stomach cramps. If you have an allergy to mold or if you’ve been drinking it for a long time, you might experience some of the following side effects: diarrhea, sneezing, runny nose, itchy nose, throat, or eyes, headache, coughing, and nasal congestion. If you have asthma, ingesting mold can trigger an asthma attack, and you might experience wheezing and shortness of breath. In most cases, taking a few sips of water with mold shouldn’t be a problem since your stomach acid should be strong enough to protect you from harm. However, it is best to avoid drinking moldy water and to clean your water bottle regularly to prevent mold growth.