One thing I did in the lab was develop suspensions for clinical studies. I'd start by adding the prescribed amount of API powder to a beaker and slowly add the suspension vehicle drop-wise while mixing with a spatula until a paste was formed. I would do this to avoid clumping in the suspension. Then I would add the rest of the vehicle. You can do this with instant hot chocolate to avoid lumps. Add the hot chocolate powder to your cup, add a small amount of hot water or milk, and stir until you have a paste. Then add the rest of your liquid while stirring. No more lumps!