That would be willpower. The question of free will isn't whether you choose to do things you want, it's whether the things you want (and choose to do) are predetermined. So you may feel like you want to drink water and you do so at your own volition because it's what you want, but that doesn't require free will - it only requires that some dopaminergic process in your brain gets triggered by a real physical demand (thirst) that motivates your body to seek water and then suddenly you think "I'm going to have some water" and you do and you feel in control. But the thirst (and the neural mechanisms of thirst and muscle action) were really in control.
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H̓̇̅̉yͤ͏mͬ͂ͧn͑̽̽̌ͪ̑͐͟o̴͊̈́͑̇m͛͌̓ͦ̑aͫ̽ͤ̇n̅̎͐̒ͫ͐c̆ͯͫ̋ ̔̃́eͯ͒rͬͬ̄҉
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