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The Laws of War on Land. Oxford, 9 September 1880.
Part II : Application of general principles #IV. Persons interned in neutral territory - Art. 81.
Art. 81. In the absence of a special convention concerning the maintenance of the interned, the neutral State supplies them with the food, clothing, and relief required by humanity.
It also takes care of the ' matériel ' brought in by the interned.
When peace has been concluded, or sooner if possible, the expenses caused by the internment are repaid to the neutral State by the belligerent State to which the interned belong.