Nowadays its so hard to get 1BTC of Bitcoin. I think the most possible way to earn 1BTC is by freelancing, if you know how to make websites, do graphic designs. This is possible.
This is what I keep on saying especially with those people like OP that doesn't want to invest. Because this amount is truly hard to get if you don't have something to offer or to sell. But if you can do a business like buying and selling of the things that you've got. Probably you can earn this amount if you can have good volume of sales.