Script to make TheBareNecessities return an empty bottle?

So after trying the various needs mods out there, I've come to the conclusion that TBN is the one that seems right. I know the latest version is broken so I'm using the old one which works perfectly. The only thing that's really bothering me is the fact that I'm basically hunting for empty bottles. Unfortunately I don't know anything about scripting so I was wondering if anyone knows how to make a script or modify the one in TBN to add this feature. Maybe someone already did this but never shared it.

this and this are the related scripts.

TBN just adds 2 kinds of water bottles, so I suppose it would just be a matter of adding an empty bottle anytime of those is consumed. In case I don't find anyone willing to do this, do you think it is something I could learn in a reasonable amount of time or is actually harder than it looks (to me at least)?