You need a surfactant in appropriate concentration and a high shear mixer or mixing process.

You should add an emulsifier or blend of emulsifiers. Take into your consideration that matching the HLB value with the HLB requirement will give good performance.

1. Decide whether you prefer to get a water in oil (w/o) or oil in water (o/w) emulsion or even w/o/w or o/w/o double emulsions

2. For the simple emulsions choose an emulsifier with high HLB which will be well water soluble to generate an o/w emulsion and vice versa for a w/o emulsion.

3. For getting finely dispersed drops use either (i) a rotor/stator dispersing device or (ii) a high pressure homogeniser / micro-fluidizer

4. In case of need for a narrow drop size distribution, us membrane emulsification (best: dynamic membrane; see e.g.:

S. Holzapfel et al. (2013); Drop Detachment from a Micro-Engineered Membrane Surface in a Dynamic Membrane Emulsification Process;

DOI: 10.1002/ceat.201300256 ; Chemical Engineering Technology, Volume 36, Issue 10; October, 2013; Pages 1785–1794

First you need an emulsifier e.g., lecithin 0.5- 2%, if you are using a simple blender /or mixture at high speed, add the water components and lecithin into the mixer cup and homoginise for 2-5 minutes and then slowly add the oil into the mixture while mixing and finally mix for 2-3 minutes.

The ratios of mineral oil and water are needed to specify first in order to know types of emulsifier you would like to get (Winsor Type I or II or else). The seleted surfactant and/or co-surfactant could be selected based on HLB and types of desired emulsion. The mixing process is simple if you choose the right emulsifiers and the ratios of the blended chemcals. You must initiate the experiments on ternary phase diagram.