Fall into the water
You plunge down into the river and come up coughing and spluttering. You’ve accidentally gotten some of the water in your mouth, and it tastes even worse than it smells!
The river is flowing quickly, and it’s difficult to swim in it. The riverbanks are very steep, and so you’ll need to find an easy spot to get out. You could either swim upstream and get on a ledge in the banking, or downstream to where you could pull yourself out using some vines hanging into the water.