I've considered a lot of unity ceremony type things — most of them don't feel like us, although the science experiment ideas are cool. Suddenly one came to me while we were in the liquor store the other day… we could do a unity rye aging ceremony!
Living just outside of Ithaca NY, we're lucky to have TWO local distilleries nearby. One of them has “age your own rye” kits for $99. (Here's the distillery's website, for any other Finger Lakes brides. You can also buy a kit online.)
The kit we purchased comes with a two-liter barrel, and two one-liter bottles of white (unaged) rye. The two bottles means we can each pour one in during the ceremony. Then we'll seal it, and have our officiant explain that we'll drink our wedding rye on our first anniversary.