Here I have cut one stick of Buff Titanium into 5 pieces. You could cut it into 6 but 1/5th fills the half pan nicely. (For full pans use 1/3 of a stick.) I added a drop or two of distilled water to the pans to soften the watercolour stick and then pressed it in. I used one piece in a Masters palette as well. The very convenient part of setting up pans or palettes like this is that you don't need to wait for them to dry.
You could just cut 1/5th off the stick for a palette and keep the rest to use as a drawing stick. They work best in less humid climates - they do tend to soften in humidity.
If you want to create my Ultimate Mixing Palette using sticks, here are the suggested sticks to buy
If you are using tubes or watercolour to make up pans or palettes, make sure you shake the tube well before you open it and always open watercolour tubes cautiously - the paint can flow out very fast at times. Ideally, fill the pan half at a time and stir thoroughly to make sure the pigment and gum arabic are thoroughly mixed. Allow to dry in a warm place and you are set to paint.
Update 11/1/2017 - see more information, including the colours painted out here.