WHAT TO BRING?
If you plan on doing a lot of train travel when you are in Japan then I suggest that you decline from bringing large, heavy suitcases. Most train stations in Japan have huge staircases (often no lift) so lugging a big suitcase is not an easy task. I suggest a good backpack would be a good choice especially for trips to Shikoku/Kochi. Rainy Season is around June/July and rain weather gear is essential. I just use an umbrella but there have been times that I have got completely soaked!! This is not the best time to visit Shikoku. Spring or late summer/early autumn are good times. Most things you will need can be purcahsed here. I don't recommend going to a hospital in Japan unless you really need to. In most cases the pharmacist will be able to help you if you tell them what is wrong and what kind of medicine you are looking for (a phrase book will have this in it). There are plenty of camping spots around Shikoku and Kochi. I would bring your gear with you as it is expensive in Japan but if you need to find stuff it is available in outdoors shops.