what other things can you think about
Hehe, I can think about a lot of things. Like naked ladies.
But getting back on topic, I suppose this third item could be almost anything. It definitely works my way, the 2-component water-isopropyl alcohol way...so if you REALLY want to make it 3 items, just throw something else in (as long as it doesn't burn about 451°F = 233°C - the temperature at which paper burns.
Update: I found out what this 'special ingredient' is. It's salt. Because if you put a salt (ANY salt...table salt, epsom salt, lithium salts, potassium salt, copper salt) the flame will be more visible since it'll have colour...like red, green, orange, depends what salt you use.
There you have it. 3-component system for 'burning' money (and keeping it too) with a coloured flame = ~50% Water + ~50% Alcohol + pinch of salt ---> these can all be put together so that only one 'dip' is necessary.