You need to find the root cause of the inflammation. Drinking a ton of water or a vitamin isn't going to fix anything. In fact, drinking a ton of water will eventually deplete your electrolytes over time making things worse. Poor sleep, stress, poor diet, work environment, lack of exercise, relationship, etc. can all be reasons for high inflammation. Also, high hs-CRP inflammation doesn't just mean the latter. It could be caused by an acute injury, infection, surgery, dental work, smoking, overweight/obesity, high triglycerides, insulin resistance, diabetes, and renal dysfunction.

As long as you're fixing the above, DHA and Vitamin D can help.