what is water glaze for? How could it be used? I tryed clicking it in battle but it didnt do anything.

for fairy skill. it uses up when you click the fs skill of your class.
http://wlodb.com/topics/1944

have you not done the quest? how could you not recall getting it when completing the quest. you can only get and use glazes once you have completed fs.

it is used to do fs
when u get fs and u are a water u use 1 water glaze to use fs 1 time
if u are wind u use wind glaze
if u are earth u use earth glaze
if u are fire u use fire glaze

Click My Squibys please ^-^

Spoiler:

If you have Water 'Fairy Skill' you can heal your teams hp and half of the sp, if I remember correctly, haven't been in the need of FS for ages.