Coconut water is actually slightly acidic. It has a pH of between 5 and 5.4, which falls on the acidic side of the neutral range (7 being neutral). So while it might taste refreshing, it has some mild acidity.
acid
acid
acid
Acid
Acid
lime juice is an acid, not a base
base
Surfer on Acid
it a base
Lemon juice is acidic.
They are both acidic
Lemon juice contains an acid (but by itself it is not an acid, because it is not a pure compound): citric acid makes lemon juice acidic.