Carbonated drinks will corrode teeth. Whether caffeine is good or bad is controversial. Whether to add ice or not depends on the occasion and environment of drinking. Some people say that "coke kills sperm", which can't be proved, but coke is indeed a high-calorie drink and may get fat.
The healthiest thing is to drink boiled water. In some cases, drinks will only deceive your feelings and make your body tissues more dehydrated, including drinks such as juice.