It's 3/4 of a liter; a liter is about one quart.
Most places will charge around $3.00 for a double (this makes about $100 per bottle, around double the original cost).
I believe there is now a standard of 3 bottles.
A handle of smirnoff costs about $20-$22 near me.
A standard drink of distilled spirits (80 proof) is one and one-half ounces either straight or in a mixed drink. It contains 0.06 oz of absolute alcohol.