SAN ANTONIO – Even if your morning commute is now just a walk from the bedroom to your home office, a hot cup of coffee can make it a little easier. And keeping the coffee hot is key, which is where a good insulated mug comes in handy. Which ones will keep your coffee hot and your iced beverages cold? For keeping drinks hot or cold, the best of the test was the 16-ounce Zojirushi for $28, which kept liquids hot for 13 1/2 hours. For a little less money, the 16-ounce Thermos Stainless King for $20 can keep your coffee hot for about seven hours.