How do I split a stack of consumable items?

I've got a stack of potions. Five of them in fact. It sure would be nice if I could put one of them into each of my party members quick slots for use in this really hard boss fight I have coming up. The usual suspects for stack splitting - shift click, control click, alt click, click, then shift click to drop, don't seem to be working, so...
How in the hell do I split up my nice stack of potions before the big fight?
Best Answer
Double-click the stacked items, choose how many instances of the items you want to move, and click accept.
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How do you split item stacks?
However, it is pretty easy to take 1 item of your stack. Simply press A on a stack in your inventory, and choose "Grab 1". It will put the single item in an empty inventory space. If you're looking to split a stack of 30 into two stacks of, say, 15 each, you're going to have to do it the way I described above.Minecraft Quick-Tip 1: Dividing a Stack of Items into 3.
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Answer 2
I just tried Control + drag the item in the same bag and it showed the option to split the items.
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