I would recommend water, and plenty of it.

You say '...other than complete saturation in water...'
What are the circumstances? Do you have limited access to water?

There are neutralising treatments on the market (eg Diphoterine) - but these are costly, and need training, and you probably still need to provide water as a backup.

Lots of water can't be wrong.

How concentrated is the acid though (if it's extremely dilute, it will be classed as irritant rather than corrosive)?

First aid information should be on the MSDS for this. Follow this advice. I would avoid using anything other than RUNNING water from a bottle or clean supply (this will dilute and remove the acid, keep it up for at least 10 mins to ensure that anything that has been absorbed into the skin is removed). Speak to the manufacturer or suppler; the MSDS should be giving you contact details which you can phone to get expert advice.

One question to ask the Diphoterine salesman is "How much acid will it neutralise?" If it's anything like the response we got, you'll stick to copious amounts of water and leave the Diphoterine to the medical experts to use as 2nd aid.

Diphoterine may well be good for small splashes on skin or in eyes but the containers are relatively small - their 'shower' version is only 5 litres - similar to a small fire extinguisher. Therefore they would not be suitable for larger splashes. Water is normally readily available so I would stick with it - it is also what all the major first aid organisations state.

Take care
JohnC

Interesting topic.
The issue with water is that it just cools the skin and flushes away any chemical that is left on the skin. Most corrosive chemicals cause a chemical burn on the skin surface but are also absorbed deeper into the tissue. Water will never draw this absorbed chemical back out of the tissue, which will continue to damage the tissue.
To the best of my knowledge and I am open to correction, if you are using a safety shower - it should deliver 60litres of water a minute and you're supposed to remain under it for 20 minutes!
From discussions with Diphoterine supplier, it not only flushes the chemical from the skin but also draws the chemical back out of the skin due to osmotic effect. As has been already said, it also chemically neutralises the chemical.
I do know of a facility where an operator was burned with 90% sulphuric or hydrochloride acid(apologies, can't remember which of the two), it occurred on a Saturday - I do believe he will require minor plastic surgery. Five of the five litre units were used on the individual on site and during the journey to hospital. He was released from hospital the following Thursday. Similar incident in Australia resulted in extensive plastic surgery for four individuals and one of them also had a leg amputated.

It really all depends on the type of facility you work in, risks associated - safety showers and Diphoterine are a last resort - and the resources available. Diphoterine is expensive, however it can be considered cheap if it delivers the type of outcome above.

By the way, I have no association with Prevor the company which manufacture Diphoterine! Hope my two cents are of use!!

In the first aid training I've had, we were told that in a workplace with chemical hazards there might be "antidotes" that we might get specific workplace training to use. First aid organisations most definitely do not rule out the use of treatments other than water for chemical splashes. Water is just the basic standard.

"Don't try this at home"