You are in a tough position because 'offers' cannot be guaranteed until you have an official letter in hand. And, when letters are sent really specific to a department and university. For example, when I was accepted to graduate school, the acceptance letter and funding were part of the same letter.

You are in a tough position because 'offers' cannot be guaranteed until you have an official letter in hand. And, when letters are sent is really specific to a department and university. For example, when I was accepted to graduate school, the acceptance letter and funding were part of the same letter.