Wet? Dry? It makes very little difference anyway; because the very first time you cast and retrieve; then your line is being loaded through water anyway, so putting it on wet or dry is irrelevant.
I use a bucket of water whenever I can’t get someone to hold the line spool on a pen or pencil for me, because for me it’s better than having the spool running free and tangling. If I can get the wife to hold the spool on a pen or pencil then that’s fine too.