You cannot make a smoothie without a blender or food processor. Perhaps you could, but it's not going to be an easy task. Because convenience and speed are among the benefits of smoothies so you'll need to invest in a quality blender if you're looking to make a nutritious smoothie.
Tips to Choose the right smoothie portable hand blender:
A blender is essential for breaking up and mixing the ingredients, including fruits and other items in the smoothie. This is something juicers are not able to do. A juicer allows you to extract only the juice from the fruit or vegetable and leave out the fiber. It isn't possible to mix in milk, ice yogurt, protein powder as well as other ingredients for smoothies.
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If you're planning to buy a blender for your smoothie consider the ingredients and fruits which will be used in the drink. A lot of fruits are soft and small and can easily be blended. Certain fruits are more difficult such as apples and pears.
Fruits and vegetables can also be difficult to blend. You should have an idea of what vegetables and fruits you'll be using so that you can pick the right blender. If you are planning the addition of ice cubes make sure that the blender you choose can handle the ice cubes.
Your blender should be strong enough to handle the fruits and vegetables you want to incorporate into your smoothies. If it's not powerful enough, you might end up with huge chunks of fruit instead of a smooth and creamy drink.