If you have some design notes please share them. A fired still would be a very helpful thing in a long term (week or more) survival situation.

Not sure what role the hole (or the PSK tin) would play in an expedient still. What other materials are presumed on-hand for this still building? I can't envision how to set up a still with the materials in my PSK. Unless you are talking about a solar still in which case you don't need the PSK tin just the garbage bag in it.

Still would require

Boiling vessel,
Condensation coil - or equivalent
Collector
All of which need to be fire safe.

So you have your boiling vessel (the PSK tin) and maybe you have a teflon hose which you can rig up to the top in such a way that it doesn't melt. (not sure that this is possible) You aim the rising steam at the underside of your plastic garbage bag (which is directly over your small cook fire and will either condense as much creosote as water or it will melt).

Maybe you have something more sophisticated in mind but I am not sure what other materials you will have on-hand at a time when you are forced to rely upon your PSK.