Quick answer: for most households, a quality filtration system beats delivery long-term — delivery only wins on convenience for high-volume offices, specific taste preferences, or areas with genuinely problematic tap water. The comparison that matters: total monthly cost per gallon, delivery reliability, and what certifications back the source claims.
The three models compared
| Model | Cost per gallon | Convenience | Best for |
|---|---|---|---|
| Bottled delivery (5-gal) | $1–2.50 | Scheduled drops, heavy lifting | Offices, high-volume households |
| Single-serve bottled | $3–8 | Grab-and-go, most plastic | Occasional use, guests |
| Home filtration | $0.10–0.50 | Unlimited on-demand | Most households, long-term |
What "spring water" vs "purified" actually means
- Spring water — sourced from a named spring, mineral content varies by source, taste differs meaningfully.
- Purified/RO water — filtered tap water processed to remove everything, then often re-mineralized for taste.
- Distilled — stripped entirely; flat-tasting but useful for specific applications (CPAPs, irons, some medical uses).
- Alkaline/mineral-added — marketing category; benefits are contested and typically exaggerated.
Certifications that matter
- NSF/ANSI standards — NSF 53 (health contaminants), NSF 42 (aesthetic), NSF 401 (emerging contaminants) for filters; NSF certification for bottled water sources.
- IBWA membership (International Bottled Water Association) — signals code-of-practice compliance.
- Third-party testing reports — legitimate delivery services publish source testing; absence is a red flag.
- Local water reports — free CCR (Consumer Confidence Report) from your utility tells you what you're actually paying to avoid.
The cost math most people miss
A 4-person household drinking 2 gallons/day: bottled delivery runs $60–150/month; quality filtration $20–40/month after a $150–400 upfront. The delivery premium pays for convenience and taste preference — neither is irrational, but most households overpay for what filtration already delivers.
When delivery genuinely wins
- Areas with contaminated or unpalatable municipal supply
- Offices with high foot traffic and no kitchen plumbing
- Temporary setups, events, renovations
- Specific mineral-content requirements (medical, brewing, etc.)