Combine the apple cider vinegar (ACV), fresh grapefruit juice, sparkling water, raw honey, cream of tartar, sea salt, and vanilla extract in a large jug. Mix well to combine.
Divide the ACV tonic evenly between 4 glasses and garnish with fresh grapefruit slices if desired.
Recipe by HormonesBalance.com at https://hormonesbalance.com/recipes/teas-drinks-tonics/vanilla-grapefruit-electrolyte-drink/