Shaking soda bottles

[Fonduede]

One package of ready-made Space Rox is in the research lounge, and the other is in the fridge in the kitchen. To make Space Rox from scratch, you need Raw Space Rox, which can be gotten in small amounts from rare candy asteroids or some other way (candy asteroids could have chocolate and mentos or whatever else, too). Maybe model the candy asteroid after a jawbreaker? Throwing ideas at the wall.

How about just the rocks that you get from mining asteroids.

It should take at least a little time to put together if it's going to be a weapon worth using. Take a look at chemical grenades or flamethrowers or the like: you have to take a few steps to put them together in order for them to work.