We are taking a 2 month trip around the SouthWest. I need oxygen 24/7. What recommendations for the oxygen do you have? We are new to using oxygen & are finding there is a variety of types. Looking at liquid oxygen but don't like idea of taking a large reservoir that needs refilling every week. Currently use pressure tanks as portable "to-go" oxygen....these are heavy & have short duration time. Also considering a small purse size, "Life Choice" that has batteries. Would also need large concentrator . Anyone have experience traveling with these issues? Thank you!