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Depending on where you are going you might not be able to be sure you will be getting all the comforts of home, like running water. If you are traveling to a 3rd world nation this is a luxury, not something every place has. So if you are packing to go to a place like this you should pack disposable. Try not to pack to many things that depend on water like razors or contacts. Get their disposable version counterparts. If you do need to use water to rinse out something (like a toothbrush) use bottled water. Even if the place has running water there is no telling if it is pure enough to drink.