Tamra,I just stick the support in the top of the jug and slant it as I put it into the ground.I slant the second support in the opposite direction so they cross in the middle of the jug.
Needless to say when using a half gallon it doesnt leave a large area for seeds.The poppies seem to spread over years so hey only need a small starter area. Sow lightly,then thin in spring when they are 4 inches high.
There is a forum on the other website that deals with Winter Sowing.