It is nice to get that many details on a single drilling method. But keep in mind - there are many more techniques for making your own well. Some might be better suited depending on the conditions.

There are hand operated drills, 150mm diameter with extension rods up to 10-15m long. If it works for your soil, then this is less messy.

I went with digging and a different type of dug well "Schachtbrunnen". I laid a pre-fabricated concrete ring on the ground and started digging inside until it sank into the ground. When it was level, I put the next ring on top. No special tool needed, a shovel, a bucket, some rope, patience and certainly a permit.