Okay so are you tryin to say there is no sort of science at all in the fairy tail magic? No gravity manipulation? No archive magic which is a pretty scientific in my opinion with all the computerized stuff. 

What I'm trying to say is that the element of the water dragon is a fairly large encompassing thing. If snow and ice are made of water should they not be considered a part of the water element? 

If you wanna remove the scientific element, let's say that through the growin mastery of hisor her magic the user of water dragon slayer magic is able to make the water hotter or colder at will. I'm not using science there. Simply a more powerful and intricate manipulation of magic. In the end it's te same thing. 

It's a concept that does make a lot of sense even in the Fairy Tail world.