Co2 help

i know that co2 is important and at the moment i cant get a tank and regulator because my room isnt sealed off airtight and its in my bed red room. im wonderin if there is anything that gives off co2 that will still be beneficial for my babies but not kill me. heard of co2 boost and those pucks you drop in water but would that be safe? lol. i dont know what level of co2 is safe for people to be around or if im crazy for trying to put co2 right next to where i sleep or what.
 
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