Simple Self-Watering Stick

This upgrades every pot with holes in the bottom, only requiring an elevated stand.

It works quite the same as the "Lechuza Self-Watering Stick", although I only found out about it after I already designed this.

If the size doesn't fit your pot, you can put them in sideways, like shown on one of the pictures (with the rope), there's also multiple STLs with different sizes.

Best used with microfiber cloth or cotton rope.

Water in the outer pot must never touch soil directly!
Outer pot should dry out between waterings (depending on plant ofc).

There's this excellent video on self-watering plants.