Most pregnant women will tell you that their taste buds aren't the same as they were pre-pregnancy. I've heard many times that the taste of water, and even an expectant mother's own saliva, can make her feel sick. Ginger ale drink is quite adept at settling an uncertain tummy, but the sugar content puts if off limits for women with gestational diabetes.
If your partner is one of these unlucky women who has been placed on a restricted diet, yet can't stand water, a fantastic alternative is a naturally flavored sparkling water.My wife loves the Poland Spring lime essence sparkling water; it tastes great and isn't overly flavored, has 0 grams of sugars and isn't loaded with suspect ingredients. Polar (if it's available in your area) has a similar offering and it's usually less expensive as well.