To handle a tray full with drinks with just one hand you’ll need some skill and balance. For those who have problems with this the one-handed serving tray will come in handy.With a handle that flexes out at a 55-degree angle, the tray’s designed to always remain in a balanced position when the handle’s in use. The tray’s surface also has a non-slip rubberized surface for extra stability and, apparently, can be used to carry not only drinks and food but even a full bottle of wine. An interesting little try that can impress your guests, and make your more confident when serving your guests. The price for this one handed tray is $69.95 at Hammacher. - Via - Cooking Gadgets & Popgadget

P.S - With a little work am sure you can make one with proper tools and materials.