I designed this watering lid snuggly fit a standard mason jar. It presses in place to create a drip-proof seal.

All you need is a standard mason jar and the metal screw on ring and you're all set.

In order for this to be drip proof ensure solid extrusion and tighten the metal ring securely. This should fit snuggly in the jar opening.

This is a quick and easy print job. No supports required.