could you get one of those replenishing water dishes.. like these 
http://www.mightypets.com/subcat.asp?0=458 once she gets a little bit bigger maybe?   
Are you going to let her have free run of the house right away when you get her?  Would you be crating her (or confining her away from your other dogs) while you are at work? (Even little yorkies may play a little too rough for her at first if you aren't there to supervise). If you were to confine her, at least until she's a little bit bigger and can hold her own with the other dogs, then you could keep her dish of water separate from the other dogs.