A good substitute for sherry depends on what you are cooking. Chicken broth and plain water often work, as do more common white wines, red wines, wine vinegars and sparkling wines. If you do not wish to use alcohol, try using a fruit juice as a substitute.
Sherry is a brandy wine that many cooks use to add depth of flavor and acidity to their dishes. However, most amateur cooks do not keep a bottle in their homes and rely on substitutes for their dishes. Because of sherry's alcohol content and high sodium levels, sherry substitutes are great for people who wish to abstain from drinking or lower the level of salt they consume.