Probably gotten about 50 of them total. You max out at 99 potions really quickly farming these too. Which can be really nice for just letting Donald and Goofy spam potions in the tougher fights.
The fact that they change the swimming/flying controls every game pisses me off. KH1 had a fine system square to go down, circle to go up. It made sense. Then in KH2 they had to go and change it to right stick for up/down. And finally in KH3 they change it to the triggers for up/down. I preferred the KH1 controls.