A potion worth 1 million dollars, 100 seconds before midnight

But only if you can demonstrate your intent to drink it.

The challenge (Kavka)

What will you do at midnight?

An eccentric billionaire places before you a vial of toxin that, if you drink it, will make you painfully ill for a day, but will not threaten your life or have any lasting effects. The billionaire will pay you one million dollars tomorrow morning if, at midnight tonight, you intend to drink the toxin tomorrow afternoon.