I always go to mcdonalds during summer drink days, and sometimes get coca cola and it is refreshing but a little bit watered down

this is like a coke with water. if you put more ice to it, the taste will be more bland, as it is already bland.

I prefer real Coke of course, but this stuff isn't half bad, it tastes ok.

It's probably weird to review a fountain drink, but I do find that the McDonald's Coca Cola fountain drink is actually pretty good. I don't recommend putting ice in it though, as I've found that they don't seem to clean out that part of the machine and the ice is usually dirty water. But as to the fountain drink itself, they have to have the best track record for me when it comes to getting the mixture of syrup to water just right. Sometimes they fudge it up, but most of the time the mixture is good and it actually tastes like Coke.