How about a blender? I’ve tested a few, and compared many in my day (for a few concrete comparisons, also check out the comparison of nutri ninja vs nutribullet! In the interest of ultimate simplicity and value, I’d recommend staying away from fancy and expensive.
Some of them are quite noisy, difficult to clean, difficult to operate and then there is the expense. I recommend one that has a reversible motor, simple operation, is easy to assemble and disassemble, has a generous jar, even if glass, and one that has metal drive gears, NOT plastic. The one that comes to mind is the Oster 7-speed reversing motor blender, model BVCB07-Z, which is going to set you back a whopping $60 from Amazon! And it will last for years and years and years.