Amazonia is the rainforest region in the south of Colombia.
Most of the Colombian Amazon (including Leticia!) is so remote and isolated that food will have to be local, and thus having fewer and more expensive vegetables, less meat, and far less dairy. On the upside, this means that you will be eating lots of fresh food, like fish and fruit, and on the downside, you might wind up eating a certain amount of canned food as well. For fish, look out for local favorites like pirarucú and dorado. The former is leaner but delicious and the latter very fatty and rich. Piranha is another common local food, since the Amazon is really full of them. While too small to make for an easy meal, piranha meat is actually quite tasty.
purified water from a river or bring your own beverages
You might assume that the remote jungle lands of Colombia might be the refuge of the FARC, but the fact is that much of it is too remote for even guerillas to operate. The extreme south is very safe (aside from natural dangers like snakes and mosquitos!), and visitors should not worry about violence on a trip to Leticia and the Amacayacu National Park. Western Putumayo, however (the extreme west of the region), is a hotbed of guerilla activity.