Declare it, and if they want they can charge your duty. Unlike grapefruits, wine is not restricted by agriculture. It is only limited to 1L for duty-free. Anything above that 1L they can charge you duty for, but they will let it in if you pay. Duty on wine should be just over $1 per bottle, so for the whole $3 or $4 they would collect it's not worth their paperwork hassle and they will probably just let you through.