How do i make a foliar feed ?

[Noreaster]

Have three plants that were having VPD problems for a week or so.. have it corrected, watered, they tope growth has perked up a bit, but lower growth still showing signs of deficiency. One is a week into flowering, the other two have started. I cant risk overwatering at this time i dont think, but i know they are starving for nutes.. how can i make a foliar feed with Green Planet Medi one organic nutes? Any advice will be appreciated!!!