for the pop bottle cut the top off bout 1/4 the way down, then flip that upside down back on the bottle after adding eggs an saltwater, find a flat place to sit it preferably in a window where will get light shove air tube into bottle after hooking up to air pump though best to add airstone to weigh it down if you do add airstone shove airline through then when it comes out where you pour the pop out of attach airstone then put that back over top of the bottle. then wait bout 24 hours though do need some light to help hatch. Currently i'm using a 24 jbj nanocube as my hatchery hatching bout 2 million or so brine shrimp a day till i get them breeding in the tank which should be soon as some of the shrimp i didn't harvest are adult size now.