I buy bottled spring water from the store and is all I use during germination and while in solo cups, I only water with a spray bottle also until transplanted out of solo cups into final planter.
I put water in a shot glass, I place the shot glass on top of one of my ball python cages because the radiant heat panel keeps the top of the cage warm with a consistent temp.
After the water has time to warm up, I place seeds in the shot glass and soak for 14-16 hours.
I fold 2 paper towels into triangles. I spray the bottom of 1 of the triangles (still using bottled spring water) and lay it on a Tupperware lid, I then spray the top of it and lay the seeds on. I spray the bottom of the 2nd paper towel triangle and gently lay it on top of the seeds so air can still get to them and then spray the top of it. I then place it back on top of a ball python cage to keep warm and spray when needed. I keep spray bottle on top of ball python cage also, this way the water in the spray bottle stays warm.
I don't put mine in a bag because I want the air flow, I put them on a Tupperware lid so when I spray the paper towels then the lid also gets wet.
This method has never failed me, I've had slow growers but the only seeds that failed to germinate were either from bag bud or seeds that were old/stored improperly.
72 hours seems like a long time to soak, from the time I start soaking them to the time I have a 1/2" tap root and put them in solo cups is anywhere from 30-50 hours.