Convert vitamin powder to something edible I would like to add a vitamin powder to some food I have but unfortunately the vitamin powder(I have read) degrades when I attempt to put in water for more then a couple days it looses its benefits according to this question.  What options do I have to add the powder to some food I have such that it doesn't involve heat/water?  I can't simple sprinkle it on top because well it the food I am trying to add it to is round and isn't an ideal solution.  Think trying to add it to check mix.  I am trying to prepare the food in advance if that isn't clear.
You could could mix it into softened butter (or a butter spread) and then top foods like toast or crackers with it.