Beer would make sense. Beer was cheap. Spirits, wine and Champagne etc. was more for officers. Eggs Liquor was popular among the Luftwaffe. They somethimes had one (when available) for an Abschuss. The white bottle with the yellow circle makes me think of a milk botlle. The smaller brown one could in fact be cough syrop. I suppose quite a few soldiers must have caught a cold in this cold forest.

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