Ron,
I'd recommend that you take with you:
Atropine (Lomotil), about a dozen plus pills. Take one pill at the first signs of serious stomach cramping. Take another if the pain or diarrhea, does not stop immediately. You can safely take 2 or 3 within the first 30 - 45 minutes. This medicine will stop the diarrhea, but it won't cure the problem.
Doxycycline, (or better, Humatin) will cure the problem. You could take a single, 100mg pill each day as a prophylactic, or 2 tablets per day as an anti-malarial. You could also wait until you get sick, then take 2 tabs, followed by a single tab 4 hours later, followed by 3 tabs per day for 4-5 days.
Tetracycline. This is the drug of choice if you get cholera (which you really don't want to get), but the doxycycline will probably take care of that problem anyway.
When you request these drugs from your doctor, he will probably refuse, and then tell you to just “get plenty of rest and drink lots of liquids.” This is BS. If you want to remain safe and enjoy your trip, demand that you get the pills. Find another doctor if you have to.
Also, take an OTC cold remedy, at least a full week's supply.
Get a liquid mosquito repellent with DEET, rather than a spray. Be careful with getting it on plastics.
Make a first-aid kit with assorted band-aids, Neosporin (good stuff), sharp scissors, assorted sizes of gauze pads, adhesive tape, sharply-pointed tweezers, alcohol, cotton pads, hard-plastic finger protector and maybe some eye drops. Take what you would need to fix a serious cut, but don't overdo it. Leave the arm-splints at home.
Peru can be a deadly-serious place to travel, mostly the danger is in the cities. Out in the field or on the road, stay alert! Always, stay alert!!! Maintain awareness and make certain anyone who focuses on you for more than a few seconds, understands that you are aware of his presence. Make a lot of noise if you have to, but get the hell out of there ASAP if anyone threatens you. Chances are that nothing like this will happen.
There's a lot of good information in my paph book in the chapter about collecting. If you don't have it I can send you a .pdf if you like.
Sounds like a fun trip...take a thin rain-jacket and some rain-pants that you don't mind getting torn.
Good hunting.
By the way....paphiopedilums are only found in Southeast Asia.
Lance Birk