Daily power-ups can actually be used every 18 hours, so if you time it correctly and can live with just 6 hours of sleep every once in a while, you can actually get away with using a daily power-up every 18 hours! There are 2 types of daily power-ups, energy drinks and stamina bars, and you can only use one of them once every 18 hours, regardless of the type that you choose.
There are 4 sizes of energy drinks: Mini Medium Mega Monster
There are 2 sizes of stamina bars: Mini Monster
The great part about these daily power-ups is that you can use them at any level! The only down-side to being able to use them all is that the game limits the full amount of energy, you will only get a percentage of it depending on what level you are.
Don't forget to send power-ups out to people! Even if you cannot offer monster sized power-ups, send the largest size that you can of either power-up: it's the thought that counts!