Shaking soda bottles

[FastKarz]

The solution is already laid out for us; animated, even.

So in that case, we need a pop-rocks snack that you can also get from the vending machine.

I wouldn't put it in the vending machine: that means there's a ready-to-go grenade kit in every single vending machine.

Put a limited number of pop-rocks snacks in some remote or restricted areas of the station, like in the research lounge or behind the HoS desk or something, and possibly miners can dig up more candy in their boxes of booze or some such.

The idea of Pop Rocks being a real rock that miners can find just so that they can make ridiculous bombs with it sounds absolutely hilarious.