The best way is by making sure both people agree on a financial strategy for the marriage and it's future. The goal is to always live below your means!
Some people are better savers when it comes to having a goal or purpose for saving ( a tropical vacation, a car, down payment on a new home...etc) For them the thought of saving just to be saving does not excite them. Now if you say the goal is to save $100k in 5 years, just having a (set amount) to shoot for may inspire some folks.
It rarely works out when a "saver" marries a "spender". Under those circumstances your best chance is to sign up for a 401k or IRA account that will automatically pull money from paychecks. Another option is to meet with a good financial planner to divise ways of setting aside money (automatically).