~をください。/ Please give me ~. Can I have ~?

ください

It's pronouced as "kudasai". if it's used as itsself, it means "Can I have?" or "Please give me.". 

～を　ください。

Here is an expression for "Can I have ~?". You can put something that you want in the part "~".

のみものを　ください。

"のみもの" means "something to drink". So, this means "Can I have something to drink" or "Please give me something to drink.". "を" is a particle of object marker. Since "のみもの" is a object, put the particle after the object.