Jet lag can ruin vacations, but experts say what you eat and drink can help minimize its effects. Eating meals on your destination’s local schedule and avoiding alcohol are key strategies for travelers. Strategic caffeine use and staying hydrated are crucial, especially with dry cabin air, to combat fatigue. Jet lag threatens to turn even a dream vacation into a slog. And with peak travel season underway, millions of people may have to contend with this disorienting condition, which can cause sleep disturbances, daytime tiredness, headaches and nasty gastrointestinal symptoms. But you can minimize the effects of jet lag — and not just by adjusting…