This is a easy and quickly made project. I'm using simple tools that most of you already have. My cup is made from birch but you can make it from any wood. It just needs to be fresh cut.
Step 1: Tools you need
But the marking gauge and the power drill makes it easier.
The ax, the froe and spookshave are used to make the bottom.
If you don't have a suitable knife look at my instructable showing how to make the perfect carving knife
Step 2: Getting the wood
Step 3: The carving
Step 4: Carving the bottom ledge
While you make the bottom store the cup in a plasticbag so it won't dry out while your working on the bottom. You can all so store it in a bucket of water. Just don't let it dry. If you want to wait to finish the cup you can store it in the freezer until you have the time to make the bottom.
Step 5: Preparing the bottom
Remember to always split the wood in the middle. That way you will get two straight pieces.
If you like you can skip this part and use a piece of plywood or a thick piece of veiner.
Step 6: Carving the bottom
Step 7: Putting the bottom in the cup
Step 8: The finished cup
''Making it watertight.''
If the bottom are accurate enough the cup will be tight. After 1-2 weeks you can test the tightens by pressing the cup to you mouth and try to blow through it. If no air gets through you will be able to use the cup for drinking.
Before I use the cup for drinking I immerse it in linseed-oil, leave it in the oil a day or two. Take the cup out of the oil, dry the excess oil of and leave the cup to dry. I like to let it dry 2-3 months, that way I'm sure that the oil are hardened all the way through.
I only use the cups with out bark for drinking. They are better when you need to clean the cup. I only use the cup for cold drink, mostly mead. I don't leave the liquid in the cup for a long time, if you do that the cup will leak at some point.