To combat New Year's Eve party hangovers, experts suggest starting the day with water and peppermint or ginger tea, avoiding caffeine due to its dehydrating effects. Low-sodium soups, vitamin B and C tablets, and coconut water are recommended for flushing toxins and restoring energy. Alternating alcoholic drinks with hydrating options like gin and tonic, or consuming a banana smoothie, can also aid recovery. Some suggest physical activity like swimming or running to release toxins, while specific cocktails like the Japanese mule, with ginger and citrus, are noted for hydration.