x2 on declaring anything. The following is from CBP regarding wine:
"Generally, one liter of alcohol per person may be entered into the U.S. duty-free by travelers who are 21 or older, although travelers coming from the U.S. Virgin Islands or other Caribbean countries are entitled to more. Additional quantities may be entered, although they will be subject to duty and Federal excise taxes, which will be assessed and collected at the port of entry.
Alcoholic beverages purchased in duty-free shops are subject to duty and federal excise tax when accompanying you into the United States. Note: Federal excise tax rates are for informational purposes only as actual tax or fee may vary according to a person's circumstances.
It is not legal for travelers under the age of 21 to import alcohol - even as a gift.
Most States restrictions on the amount of alcohol that can be brought into that State apply only to residents of that State. Usually people transiting a state are not subject to those restrictions, but sometimes regulations change, and if this is a matter of utmost importance to you, you can check with the state Alcohol Beverage Control Board where you will be arriving to find out what their policies are.
There is no federal limit on the amount of alcohol a traveler may import into the U.S. for personal use, however, large quantities might raise the suspicion that the importation is for commercial purposes, and a CBP officer could require the importer to obtain an Alcohol and Tobacco Tax and Trade Bureau (TTB) import license (which is required for all commercial importations) before releasing it. A general rule of thumb is that 1 case of alcohol is a personal use quantity - although travelers are still subject to state restrictions which may allow less.
NOTE: The above information is applicable to homemade wine and follows the same procedure as store bought wine. The bottles should be properly labeled."