The other thing is water. After Edale and the bridge at Jacobs Ladder, the next clear water is at Kinder Downfall. When I walked the PW, there had been much rain in the days prior. I did Edale to Standedge in one go and the only clear water after the Downfall was near to Standedge. All the other streams were peat black/brown, and I was fairly dehydrated by the time found that first drinkable water.
Dave.
I've always managed to get excellent clear water near the top of Hern Clough on the way up to Bleaklow.
As the stream valley gets narrow you cross the stream several times and eventually walk up a rocky bed.
Just before that there's a big thick bank of vegetated peaty soil on your right with water flowing out in several places (maybe in only one place when things are exceptionally dry).
I've been drinking this water untreated for years and it is absolutely fine.
I also found plenty of water down by Wessenden Reservoirs, in streams flowing off the moor.