oops, I misread the question - editing... done
Spoiler:
Finally something easy enough for me
Ok, now again:
you HAVE
buckets:. .. .. ..
3 7 16
volume inside: 0 0 15,x
volume inside: 3 0 12,x
volume inside: 0 3 09,x
volume inside: 3 3 09,x
volume inside: 0 6 09,x
volume inside: 3 6 06,x
volume inside: 2 7 09,x
volume inside: 2 7 00
volume inside: 0 7 02
volume inside: 3 4 02
volume inside: 0 4 05
volume inside: 3 1 05
volume inside: 0 1
08
I'm really sorry for not having enough time for your puzzles, they are great!!!