This time I carried:
Zink salve/ointment (baby butt ointment)
Wet wipes (a plastic container with 50 wipes claiming to kill some 99,8% of all bacteria)
2 pairs of bike shorts
First of all I never used the chamois cream - I sent it home and was happy about that.
What I did: When I did not have the possibility to shower I would clean my crotch/butt with 1 wet wipe. I did this notoriously from day 1 even though it did not hurt. The next day I would use the other pair of shorts. Normally I would not wash the shorts each day by hand but rather wait some days for a real washing machine. Eventually the furuncles would emerge again, but thats when I used the zink cream: Applied it before sleep and the next day everything was gone. I believe I used the zink cream 5 days out of 30 riding days. On this trip I had no butt problems whatsoever, even after 130 mi riding days!
For me, I have realized that saddles get to much attention when solving butt problems. I do believe that the hygiene in the crotch/butt area is vital and is more important than the perfect saddle. Then again, I don't like the idea of having chamois cream being rubbed into the pad - I'm affraid that the cream will enhance bacteria growth and that it cannot be suffiently cleaned when doing a hand wash in a sink.