Secret Stash should turn Refillables into Biscuit Jars

'cause it's kinda silly that you implemented these cool new potions and made it mutually exclusive with the cool new potion mastery...

Also, could you make it easier to buy Refillable Potions while you have a Health Potion in your inventory? Maybe auto-sell them when you try to buy the Refillable? Without fail every time I try to buy a Refillable it takes me too long to figure out why it's disabled. :(