try using the scent mask near the wood sign showing the potions shop youll find a purple
gas;scoop it in a botttle. if you go to the potion shop giving the shroom to kotake shell
give you a FREE blue potion

THE GUIDE WAS WRONG.I KNOW ONE PLACE THAT AS THE PURPLE GAS IT'S THE STOCK PIT INN GO TO
THE 2ND FLOOR GO IN THE DOOR THAT AS THE SONG OF STORMS FROM THE OCARINE OF TIME.THE SONG
OF STORMS NOTES ARE[A DOWN UP,A DOWN UP].

put on the mas at the owl statue at the swamp wait a few minutes it takes a few minutes
for the cloud to come up( when i say minutes i mean the minutes in the game) then put it
in a bottle give it to the potion witch lady and leave the shop and then re enter purchase
a blue potion and she will give it to you for FREE!!!!!!!!!!!