I can see not wanting to mix the two together, so you get the appeal of PB&J right away, instead of a murky color, but this is not a simple solution and will cost you a fortune, either in R&D, or in a dual-chamber bottle. And in the end both are gimicky, and you limit what your products can do. Do you always use PB&J together? NO! So don't decide for your customer. Sell them in a 2-pack, in an open-faced box and market it as PB&J but let the customer decide if they want to use together or separate. If someone wants to make PB&J ice cream, they will take the time to use both bottles, but they also have the freedom to use just one. Peanut sauce for chicken satay? They can grab your PB one, but if it has jelly in it forget it. How often do people use PB&J together? On bread. So why would you buy them both in a hot sauce? Simply use it as a theme for a peanut sauce and a fruit sauce, packaged together.