i recommend you look into sous vide as well.

although plastic bags can obviously leach into your food supposedly there are silicon pouches for sous vide that should be more chemically stable.

i used to think sous vide machines are big and expensive but then i learned you can use small inexpensive IMMERSION sous vide devices using any container of your choosing for water ... including just regular plastic storage containers

the temperature used for Sous Vide is so low that it won't melt the plastic bin ...