There are several ways of doing a chain cleaning while touring. One is to wipe the chain using a clean coffee filter...yes a coffee filter, one of those cone shaped ones, (you can use the filter to wipe down the gears and chain rings too, but first knock off as much as you can with an old tooth brush), then tear a used one into thirds and roll the section filter tight so it can fit between the links and start running it through each link, then relube. Coffee filters are very absorbent, and their tough so little worries about it ripping. You may have to use 3 or 4 each time depending on how long between cleanings you wait, do not run the chain backwards, instead rub the chain one link at a time. These filters don't weigh much and can be found anywhere in the world, and when you're done with the filter simply throw it in the trash.
You can also use the Dawn for Dishes (the best for grease removal) for cleaning your camping utensils. Simply use a wet rag with some Dawn on it and run the chain through it, take an old toothbrush and start scrubbing, wipe again with the Dawn rag, spritz some water over the chain and wipe with a clean rag, wait for the chain to dry and relube. This method is a little less practical than the above coffee filter method because you always are going to need clean rags at your disposal, and you don't really want dirty greasy rags in your pannier.
Oil wise, unless you know for certain it will never rain during your tour, you should use a semi wet lube like ProGold's ProLink Xtreme chain lube, it lasts a long time in the dry and wet, it doesn't excel in dry conditions and it doesn't excel in wet conditions but it performs really well in both which is what you encounter touring, plus it cleans off easily with a filter.
And as a side note, the coffee filters, a clean one for this of course, can be used to make pourover coffee. Simply buy a Melitta 1 cup brewing cone (their less than $10, and they're small so as not to take up much space), set if over a mug, insert filter, pre dampen the filter, add ground coffee, and hot water between 195 and 205 degrees fahrenheit (a little tricky when touring unless you buy a small digital cooking thermometer, but getting the water temp right is idea for making great tasting coffee, they're also cheap at under $20), then slowly pour the water over the grounds in a swirl like motion to get all the grounds saturated and keep doing that till you have your cup of coffee.