Prepared mud to be tested for Mud balance, API filter press, Viscosity, Gel strength? So how much of materials and how much amount of materials to be added for water/oil based drilling mud in what way it should be added?
Have a look here for water-based mud mixing - https://www.researchgate.net/post/How_can_I_prepare_standard_water_based_drilling_fluid_in_the_lab_materials_and_quantities
And here for oil-based mud mixing - https://www.researchgate.net/post/Amount_of_contents_of_Oil_Based_Drilling_Mud
You can also refer to API RECOMMENDED PRACTICE 13I (Recommended Practice for Laboratory Testing of Drilling Fluids).