To put words into an example, since I was eating an apple anyways .... here's a very brief setup and steps.
1 - find an Apple. normal image/exposure
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2 - Get camera. For this "simple" example I got a flashlight, and created a "snoot" for it. FYI, I did this entire thing right next to my sink ... very simple.
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3 - Now I adjusted ISO, Aperture and Shutter to make the image black - well nearly, you can still see the edge of the sink. This eliminates Ambient light. Yes, the Kitchen lights were still on.
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4 - Now I took a picture of the Apple with the snooted flashlight. But as you can see, you can see the counter top.
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5 - so I put a nearly black piece of construction paper underneath it.
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6 - and to further separate the Apple from the background I used half of a toilet paper cardboard tube.
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7 - now I took a couple pictures and to enhance the effect I did turn off the overhead lights.
That's about it. It took maybe 15 minutes and most of that was wandering around finding black construction paper and then a cardboard tube and cutting it. And yeah, I was eating the apple during it too.
Now you'll have to add the glycerin for the water beads. And make a more elaborate setup to get it exactly how you want it. But the "base" concept is fairly easy.