no offence but probably not ... people don't know you, they don't know about your hygiene etc, such as how clean the mixing cups are, how the stuff is stored, how long is the carton open for, how is it stored, how often do you wash your blender, how do you keep it chilled, how often do you wash your hands, what condition is your work station and kitchen, you are a kid so people wont expect you to know about it all - but all that stuff will go through peoples minds - you have no health and hygiene cert so you may find you are not allowed to do this unless your premises pass a certificate...
not wanting to bring a downer on you but these days there are so many rules, you may be best looking into them before spending money etc then finding you are not allowed.
why not make something? can you draw?