Aiko

One thing to flag rather than advise on, because it is genuinely not a forum question: vinegar and ginger can interact with some conditions and medications. Diabetes, digestive disorders, anything you are taking regularly, that is a conversation with whoever prescribes it rather than with us.

Otherwise: dilute it well, keep it in the fridge, follow your recipe's storage time, and treat it as a drink rather than as hydration.

A glass with food is a sensible shape for it and it is roughly how the drink was used originally. The jug-instead-of-water version is the new part. Nobody here can tell you a number for your own teeth, which is a dentist question, but moving from all day to with meals is the change that matters.

Both, for different reasons, and sipping it all day is the part doing the damage rather than the total amount. Vinegar is acidic and repeated contact wears at tooth enamel over time, and all-day sipping means your teeth are never out of it.

Dilute it properly rather than drinking a strong mixture, have it with meals instead of continuously, use a straw, rinse with plain water afterwards, and do not brush immediately, because brushing straight after something acidic is harder on enamel than waiting.