Brew cocoa beans in water to make Coffee, which gives you Speed, Haste and Strength for a short time.
A nasty potion that withers living things, brewed using a Wither Rose with an Awkward Potion base.
Right-click on a cake with a redstone extended potion to imbue it. Each slice of the cake will give you the potion effect when eaten. You may also use a dispenser to apply the potion to the cake.