If you can, remove just the amount you need and melt it at about 100 - 110 F (or 35 - 40 C).
You should add a surfactant and hardening agent for best results. However, you should run a test first to see if these are needed. As for diluting, some emulsions need it and some do not. The company should supply specifications, but if they do not, you may need to use some trial and error to find out what to use.
Usually, the spread or "lay down" of a silver halide emulsion of this sort is about 5 - 15 ml per square ft. That would be about 45 - 135 ml per square meter at a rough estimate. Again, experimentation is necessary if the company does not give any data.