How to avoid chafing forever!?

Like quite a few people, I suffer from chafing of my legs, particularly in the summer when I wear shorts or dresses. I HATE IT so much! In just over a month, I will be going to Europe, and will spend 3 weeks walking around, and in places like Italy, it's gonna be hot! I really don't want to be dealing with rashes, and putting penaten cream on every night! But at the same time, I know that no diet or toning exercise will clear up the problem in time, though it may improve it. Are there any techniques or things I can do to avoid this problem?