Intravenous hydration is way better than just drinking all that stuff
Chugging these bags’ contents wouldn’t taste good and, much more importantly, wouldn’t be very efficient. A much lower percentage of orally consumed fluid (and the good stuff in it) will be properly absorbed for hangover fighting, and it can take hours (vs. IVs, which are almost immediate).
Also, anti-inflammatory meds are way more effective through an IV
The amount of ibuprofen, etc, in one of these drip bags is notably more than you can acquire in a standard over-the-counter dosage, and it’s more effective delivered right to the veins than taken in pill form. That’s because alcohol causes direct damage to the stomach and esophageal linings. While they’re healing themselves, they don’t have time to be absorbing a max dose of headache pills.