When I traveled to Bermuda on a cruise maybe now 2 years ago?, my fiancé and I took home 4 or 5 bottles of alcohol with 2 of them being Gosling's rum (Bermuda made). We split it up and declared the bottles on our declaration forms. We got to carry it all off the ship with us. Just smiled, spoke politely, calm and collected to the customs officers when we arrived back in NY and went on our way.
As for flying, which I'm assuming you're going to be doing, just pack it in your checked luggage. The way your luggage gets handled, wrap everything up really good and put all your clothes around the bottles as a cushion, even if you have to use dirty clothes as gross as it might sound. I found a website that suggested bringing some bubble wrap and some plastic bags for transport should you get liquor to bring home with you. I'm going to do that and pack some when I go to St. Lucia later this year.
I've also had family buy liquor in the airport terminal, but the prices were a bit steep. I expected that because, well, it's the airport and nothings cheap.
And yes, I would declare it. If you're traveling with any friends or family who isn't buying any alcohol, by all means ask them if they can help you and put some on their declaration and pack it in their bags.
Here's what I found for you from the US Customs website since now you got me curious about the rules. I read just a few minutes ago, if you're not sure if something should be declared, just declare it to be safe and avoid issues.
https://help.cbp.gov/app/answers/detail/a_id/424/kw/alcohol allowance/session/L3RpbWUvMTQ5MzI2NDY5Mi9zaWQvemYyZUc2aG4=
Also, found this website for you as well which seems more directly involved with Aruba.
http://caribya.com/aruba/customs/
Hope all the information helps you! Have a great time and take a lot of pictures.