I know, I know ... there's been a LOT written here on making the "best" margarita. But I haven't found exactly what I'm looking for. There's a local Mexican restaurant we go to fairly often that's BYO. On many occasions I've brought along ALL the margarita fixin's -- salt and all -- and mixed margaritas at the table. But to make things a bit less cumbersome, I'd like to bring a pitcher of everything-but-the-tequila margaritas that will enable us to pour our "mix" plus our tequila over ice, stir, and drink. No, I'm not interested in the limeade recipe, or any other ready-made mix. I want to end up with the real deal. One of the things that's throwing me off is that when I make margaritas at home, I generally put the ingredients into the blender with ice. But if I do that at home and then bring the frozen concoction to the restaurant, by the time we drink them they'll be watered down. I'm recipe challenged here, folks. Can you help me?