I show a little video of a project I did today and mentioned giving you guys a recipe for a soilless soil like BM6. So check it here:
1:1:1 ratio
Coconut coir or Peat Moss
Perlite
Compost
Then once in place wet the mixture thoroughly. This may take some time.
Depending on the acidity of your peat moss, you might want to add a little bit of lime to balance it out.