Take the lid assembly of the Infusion Water Bottle off and set aside.
Cut lime into 4 or 5 pieces.
hand squeeze the pieces of lime, one at a time, into the Infusion Water Bottle and drop the lime into it.
Add the simple syrup.
Muddle the lime and simple syrup together until well mixed.
Add the tequila, triple sec, and bitters.
Put the lid assembly on the Infusion Water Bottle being sure to keep the lime under the basket.
Tip the lid far enough to add ice to the top of the Infusion Water Bottle.
Fill the rest of the Infusion Water Bottle with sparkling water.
Give a little shake to work the lid into position and screw on lid.
Enjoy your Margarita Fizzy from the flip-up opening . When half gone add more sparkling water as desired.
If using the flip-up straw, carefully mix the soda and tequila mixture first. I blow air through the straw to force the tequila mixture into the upper part of the cocktail.