somehow I still don't get when it is ok to omit the article - I put in "La bottiglia é tua" and it was wrong. Can someone shed some light on this please?
You always always use an article on everything. The only case when you don't is when you talk about inmediate family (mom, dad, brother, sister, aunt, etc)
Cloeastrid8 is correct - you must write what you hear. Normally though, you could leave out the article (just use tua) because the article is OPTIONAL when the possessive is alone in the predicate.
I am having a problem with the accent on the e , I have just realised that their are two versions of an accent on an e . .....Can anyone suggest why and how can you decide which one to use