Kavkas toxin puzzle

The original puzzle formulation is as follows:

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. He emphasizes that you need not drink the toxin to receive the money; in fact, the money will already be in your bank account hours before the time for drinking it arrives, if you succeed. All you have to do is. . . intend at midnight tonight to drink the stuff tomorrow afternoon. You are perfectly free to change your mind after receiving the money and not drink the toxin.

– source

The main line of thinking here is that no one, after receiving the million dollars, would still choose to drink the toxin when they can now avoid it. But, knowing that you will not choose to drink the toxin in the afternoon once it arrives, can you now intend to take the toxin in the following afternoon? Put another way, can you intend to drink the toxin now if you intend to later change your mind?