I wanna make benihanas shrimp sauce?

All the recipes call for garlic juice? I've never heard of this. How could I make garlic juice? Or could I sub something? I live in a small town and I doubt any grocery stores carry it......I wanna make benihanas shrimp sauce?
BENIHANAS SHRIMP SAUCE



2 cups mayonnaise

1/2 cup water

1 teaspoon sugar

1/4 teaspoon salt

1 Tablespoon garlic juice *

3/4 teaspoon ketchup

1 teaspoon ground ginger



Mix all the ingredients real well with a wire whisk.

Makes 2 1/2 cups



* = 1/4 teaspoon granulated garlic = 1/2 teaspoon garlic juice

or

1/8 teaspoon garlic powder = 1/2 teaspoon garlic juice

1 teaspoon hot sauce

1 teaspoon dry mustard

1 teaspoon paprika

3/4 teaspoon white pepper