Coconut water is definitely a good source of potassium.
It also often contains a high sugar count (15 grams) for an 8 oz serving making it not as desirable as other potassium sources for some individuals who are attempting to keep carbohydrate consumption low so as not to spike their glucose levels and trigger that cycle of insulin production response.
By comparison,
Live Better brand of coconut water has only 3 grams of sugar in 8 oz but less potassium at 440 mg/8 oz.
Just be aware of the sugar content of whatever brand you choose. The LS V8 label by comparison had only 5 g of sugar, but then they do add potassium chloride to the V8 whereas the coconut water is all natural potassium. Depends on what your gut tolerates.
Keep in mind as well, there are bottled
Organic veggie juices that have the added advantage of not consuming pesticides and agri-chemicals ... (also coconut water is typically free of those as well because of way they grow.)
Knudsen Organic LS Very Veggie has the advantage of being organic' thus, avoiding the agri-chemicals, comes in a glass bottle avoiding BPA container coatings, but the Carb content is 12 grams of carbs with 8 grams from sugar and 520 g. natural potassium.
Jackie