Well, it's been awhile! But I have a very good excuse: EXAMS ;)
Now that summer has officially begun for me, I won't be neglecting my blog any more :D
How did the word "toast" get into the expression "drink a toast"?
The "toast" was once in the glass. The custom was to place a small piece of toast in the bottom of the glass as a delicacy. And, since in drinking to a person you drained your glass, you "drank" this bit of "toast."