I always read all the threads on blisters because I always get them!!!
Here's a great (long) thread with many tips on how to prevent blisters:
Blister thread
Tips that I've learned/read here:
Wear comfortable, well fitted, well worn shoes. Alternate your shoes. Bring at least 2 pairs.
Buy socks that reduce moisture like Cool Max and that fit well.
Wear really comfortable walking shoes or sandals...I love my Ecco Cosmos!!
Bring pre-cut Moleskins to prevent the blisters. You put it on the hot spots.
Bring some Bodyglide or Avon's anti-blister balm or BlisterShield to put on your hot spots and it can prevent the blister AND chafing. Here's a thread on these products:
Bodyglide/Blistershield thread
Bring bandaids or corn protectors for existing blisters.
Bring pain killers to reduce the pain and swelling.
Bring a peppermint spray or cream for your aching feet! It feels great!
Soak your feet every night if you can (then put the peppermint cream on!)
Some say to try anitpersperant ...didn't work for me.
Some say try duck tape...not for me.
Some say vaceline between the toes...I've never tried it but I'll bet it helps reduce friction.
I did not get blisters on my last trip and it was the first time. I think it's because I wore my comfortable walking sandals the whole week (no socks or sneakers), I used
moleskins on any hot spots, I soaked my feet every night, I put the peppermint cream on my feet every night, I took Motrin every day, and I put
Bodyglide on my feet every morning before I put my sandals on.
Good luck!