expansion of the potion system **new item boiler flask**

This vision adds additional functionality to a cauldron by allowing you to mix different potions at the cauldron. You add any combination and the key attribute of the potion is weighted by how many there are. For example:  Night vision 8:00 + water breathing 8:00 + water breathing 8:00 yields a new potion with effects, Night vision 2:67 and water breathing for 5:33. This can then be extracted with empty bottles or a "boiler flask". 
The new boiler flask will be crafted from 3 empty bottles with 3 levels or stacks. consuming uses one level. 

mixing equation is simply round[(p1 + p2 + p3)/3]. where p1,p2, p3 are the potion key attribute. 

This could create very unique and personalized potions to Minecraft.