Drinking algae-contaminated tap water is not advised. Although consuming small quantities of algae-contaminated water may not be dangerous, you may experience signs such as vomiting, headache, nausea, diarrhea, rash, and abdominal pain. Algae-contaminated water in the Brita water bottle filter has not smell and taste good. The contamination chance of your water filtration with algae can increase when you use water from a private well.