Sap! Sparkling Water from Trees. The entrepreneurs at Sap! make seltzer and soda from maple sap, and now they’ve expanded into sparkling water crafted from the sap of birch trees. Birch sap has more of a tart raspberry taste than maple sap and blends well with other infused flavors such as Ginger & Lemongrass and Tangerine & Chamomile. You get an upscale drinking experience without the alcohol or sugar.