What a drip does that a bottle of water cannot
The fluid itself matters more than most marketing admits. The workhorse is 0.9 per cent sodium chloride — normal saline — which is mixed to roughly match the osmolality of your blood, meaning it neither pulls water out of your cells nor floods them. Some providers use lactated Ringer's or Hartmann's solution instead, which adds potassium, calcium and lactate in proportions closer to plasma. Everything else on the menu — vitamin cocktails, glutathione, NAD+ — is an additive dissolved into one of these carrier fluids.
Here is the honest part: for a healthy adult who is mildly dehydrated and can keep fluids down, oral rehydration works nearly as well and costs a few dirhams at any pharmacy. IV therapy earns its keep when the gut route is compromised — vomiting, severe nausea, heat exhaustion — or when someone wants rapid rehydration with electrolytes after significant fluid loss. A good provider will tell you this. A provider who insists a drip is always superior to drinking is selling, not advising.