Bottle Mockup Creator
I just rediscovered smartmockups.com because they not only do book covers and t-shirts, they also provide quick, free mockups for bottles, supplement bottles, wine bottles... soda cans, smartphones, mugs, laptops, art frames, billboards, you name it.
smartmockups.com/mockups is a user-friendly tool that quickly creates mockups of pretty much anything you can think of. I love it's simplicity, ease of use and quick customizability (like changing a bottle to black, for example). Here are some screenshots of their mockups available:
They have wine bottle mockups, too:
To see this in action, here's an example of a supplement bottle mockup for one of my clients. I simply uploaded my JPG file of the label art, and then I could size it as desired on the bottle, and was even able to change the mockup of the bottle to be a black bottle with a black cap. Pretty impressive and so easy to use! Beats using Photoshop to create mockups! These are great for use in online stores if you can't get a good shot of your product to clip it out on a white background.
Original art, above