What hot beverage can we drink other than red date tea during confinement period?

Depends on which culture's confinement you are looking at. I heard that in Chinese confinement practices, water is a no-no as it will cause water retention so hot drinks like ginger-date tea and longan-date tea are commonly served. Some of my friends took DOM wine but some don't because of nursing concerns. If I'm not wrong, they took Yomeishu instead. For Malay confinement, I was told that water is okay, just make sure that the water is warm. There's alot of jamu (traditional herbal) drinks in the confinement diet. Here's an interesting comparative table of Indian, Chinese and Malay confinement pratices at a glance. All in all, the three cultural practices' aim is to purge out the “wind” in the body after delivery, promote “blood circulation”, strengthen the joints and promote milk supply and to basically avoid “cooling” foods. http://www.healthxchange.com.sg/healthyliving/womenhealth/Pages/confinement-food-in-chinese-malay-and-indian-cultures.aspx