Hi,
You can also try a water bottle (bought new) from the pet store. A lot of people who get puppies too early (and those who don't) have had luck with those.

My friend's little Maltese does WONDERFUL with these water bottles, and prefers them over a bowl. Just keep it clean and have fresh water in it at all times.
http://www.kmart.com/shc/s/p_10151_1...0070926x00003a
Additionally, there's no such thing as a teacup Yorkie, it is a marketing scheme used by (some) not-so-desirable breeders to make the puppy seem that it is worth more than others. A lot of times these puppies can be sickly or become sick later. A Yorkie is just a Yorkie.

Lastly, a Yorkie really shouldn't leave his or her mommy until around 12 weeks. I discovered these things when I joined YorkieTalk, along with a whole host of other things....about a month ago.
There's a LOT of information here, and LOTS of great people to help you gently along the way!
I hope you stay! Welcome to YT