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After the previous topic about coil in bucket vs liebig, I decided to make another coil condenser. The previous one was made out of 4m long, 22mm diameter copper coil in 65 liters PVC bucket. The new one I want to be made of 5m long, 18mm diameter copper coil in 40 liters PP bucket. The bucket will be narrower and taller.

My question is, how should I bend (twist) the coils so that it will turn out nice, without strangulations (flattening)? I know there are a few tricks:
1. Fill the pipe with sand or fine salt then bend.
2. Fill it with water, close the heads and solder, then bend.

Do you have any better ideas?

I've never made a worm before, but from all the wart chiller videos I've seen, they just wind the coil with nothing inside. In all of those videos they used soft copper tubing, the winding was not at tight radius and it just worked.

With smaller coils like in 2", 3" and 4" I've always used salt otherwise it would flatten or kink.

Bend it around a Cornelius keg, or a #10 (restaurant size) soup can, no filler required.