I've been using a weekly food delivery service this year, and lugging heavy gel packs to the trash was getting pretty tedious. They recently switched to a diff

I've been using a weekly food delivery service this year, and lugging heavy gel packs to the trash was getting pretty tedious. They recently switched to a different brand of gel that claims to be "100% drain safe", so I can ship the mass away without going outside. Are there other forms of waste that could benefit from liquid disposal? For example, I once received a package with water-soluble packing peanuts.