The inside must be sealed or it will mould and can leak from small cracks. We use Bottle gourds lined with brewers pitch for our 18th century reenacting unit. We follow the same instructions that Beowulf had outlined. We use brewers pitch because it has a higher melt point. By the way Brewers pitch has a residual taste that can last quite a while. There is also a synthetic brewers pitch that has no residual taste.
I have used bees wax to seal leather mugs. The bees wax doesn't leave much of a taste in the water.
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