How Much Oxygen To Give A 10 Day Old Kitten In An Oxygen Tent?

I would like to know how much oxygen should be given to a 10 day old kitten in an oxygen tent. I am asking about the requirements for Oxygen tents and tanks? What size tank is needed, do they come with or without gauge and what size gauge should the tank have. How much air does it hold and can i put 20 days worth of air in one bag? Is there any other type of tent that we could use instead of an oxygen tent if we wanted to go all natural? Thank you for your help!