Orange Juice: This also replaces the Aperol. Any orange juice will work, just go for pulp free and the least amount of added sugar possible. Hand squeezed orange juice taste the best in my opinion.
Grapefruit Juice: This replaces the Aperol. Any grapefruit juice will work, just go for pulp free and the least amount of added sugar possible. Hand squeezed grapefruit juice tastes the best in my opinion.
Cherry Juice: This is to replace the bitters. Be sure you are using 100% juice without added sugar.
Mineral Water: This replaces the champagne. See note above.