Get the piece of thin wood or cardboard
 Cutt off 1 1/2 " to make the board now 12" by 20 1/2 or so
now cut in 1/2 to make two equal pieces
Cut a piece of materiel you wish to use for you B.O.S to 16" X 26"
and a piece 11" x 21"
Lay out largest cloth
cover one side of the boards with a thin layer of glue
Place boards on it with the smallest in the middle (the spine)
just a bit of space between them so the book will flex
Let dry for a day of so.
Fold the edges of the material around the boards edges and glue down.
trim corners to reduce bulk
Put a layer of glue on small cloth. Use this to line inside of boards and cover rough edges. Fold partially closed to dry so it will flex when dry.
Punch parallel holes in the spine at the top, middle, and bottom.
Lace each set with a leather tie or hemp rope, or something else if preferred
 To fill it simply punch holes and lace with the leather ties.

mix together thoroughly and keep in glass jar/bottle with stopper. i use these before most of my magickal workings and find it helps me focus. you dont need to add too much and the salts keep.