How many times can the silicone cap and lid be reused?
If you are careful with it, indefinitely.
What products are required for refilling a capsule for brewing, and storing filled capsules for later use?
For brewing, all you need is a silicone cap. The use of a filter depends on personal preference. For storing refilled capsules and maintaining freshness, you need a silicone lid to place on the refilled capsule.
Is the filter required?
The use of the filter is purely based on personal preference. Some find the filter is beneficial in reducing coffee particulates and others see no difference in using just the silicone cap without a filter. The choice is yours!
What type of coffee should I use?
Always use a fresh, high quality coffee. The crema and strength will vary depending on the type used.