We (my daughter and I) are building some time capsules in a bottle, i.e., putting photos, letters, small memories and so inside some glass bottles.
We plan to have a good lifespan of some: 10 years, 25 years and 50 years. They will be buried about 3 foot deep in places that won't have any load, so we're confident that they will not break.
But I'm afraid about humidity and mold. Using common tools and materials, how can I prevent mold from building in? And how can I seal the bottle, so that there is no humidity to damage our paper?