Apple cider vinegar in roasting pan
If you don't have any turkey, chicken, or vegetable stock or bouillon on hand, I would recommend using all water. That said, without stock or dissolved bouillon, your vegetables will not get the added extra flavor.

I would recommend adding a small amount of salt and/or other seasonings to the water so the vegetables won't be bland. E.g. of others, white or black pepper, poultry seasoning, garlic powder, or a spice blend like Mrs. Dash. Go light, as you can always add more later.

As others have commented, one cup is a huge amount of vinegar. And even a small amount of vinegar is likely to give the turkey an off taste and definitely will hurt the taste of the vegetables.