Heat butter in saute pan over medium heat. Add the garlic, artichokes, and spinach. Saute for 2 minutes. Set aside.
Place wine, water, lemon juice, cornstarch, pepper, and cheeses into the Vitamix® container in the order listed and secure lid.
Select Variable 1.
Turn machine on and slowly increase speed to Variable 10, then to High.
Blend for 3-4 minutes until mixture is smooth and warm.
Pour mixture into fondue pot.
Stir in spinach and artichoke mixture.