Permethrin is very effective. I keep a pair of "woods pants" that I treat with the Sawyer spray, re-treating a couple times over the summer. Wash them as little as possible. I've caught a couple ticks on me with the treated pants but nothing compared to the dozen I will get without them.

Picaridin is the only spray repellent I've found that has any effect on ticks. It's pretty good but expensive. I get the lotion and use it on my waistline, sock line, and my neck area for any ticks that are waiting on high brush.

Word of warning: wet permethrin is toxic to cats, so don't treat clothing around kitties if you have any. It's fine when it's dry.

Any Doctor or urgent care place should give you a prescription for antibiotics if you report a tick bite, but you shouldn't do this just because you find one latched on. If you're doing regular tick checks, you should know if a tick has been on you for less than a day. Check your entire body every time you go out in nature and you'll never need the doxycycline. However you can get a script pretty easily in case of any mistakes.