Don't have any opening to fill in beans or by mistake water, Get beans in a sealed container, sealed with cardboard at the bottom, which the machine can penetra

Don't have any opening to fill in beans or by mistake water, Get beans in a sealed container, sealed with cardboard at the bottom, which the machine can penetrate. Another solution is to connect bean jar through a pipe to bigger source of beans similar to how water is sourced. The bean source is maintained by a dedicated person. If they cannot learn how at use it,restrict access thats the way to go!