Hello Rindert!
I have seen the files you have uploaded, I could create the mockup for your whiskey bottle. It is not a problem to have layered Photoshop file which can later be edited to add different labels and liquid.
What would I like to know is - do you have the images of the bottle or should it be created as a 3d model? Price and the timeframe will depend on which of those two approaches we decide to take.
I have been working as a graphic designer for 5 years now, and one of the tasks I am working on daily is making presentations of the packages I make for my clients. I have been working on numerous cosmetics packages, boxes, food packages etc...
It is a straightforward process for someone who knows how to do it, we could have the finished files in a couple of days, so you can have this done and can focus on other aspects of your business. Feel free to send me a message, and we can talk more.
I am looking forward to hearing from you!
Regards,
Nevena P.