By not spending it.
If you want saving, then don't spend it. Of course inflation will eat it away, so definitely you should invest in some very low risk investments.
ANSWER: Low risk investments!
Well, we could save by not spending but what about the necessities we need? Nothing is for free nowadays.
We just need to invest wisely and go for that which are high in ROI.

High ROI = must be high-risk
If you can afford to lose then yeah go ahead and invest in several high-risk titles.
But your life savings should not be in high-risk titles. Of course, investing in a savings account which interest is lower than inflation is stupid...