Water footprint labels on consumer products?

Water footprint labels on consumer products?

Would labels be useful at all?
If so, what should the label comprise?

An article related to the question can be found here - different points of view are presented:
Will we ever see water footprint labels on consumer products?
Displaying water inputs on consumer items is an idea floated frequently, but is it any closer to it becoming reality?
by Will Henley, the guardian, 23 August 2013

A recent study (completed 2012) investigated labelling of consumer products in some detail:
" Research on EU product label options"
Study delivered by Ipsos MORI, London Economics and AEA for the European Commission

The final report can be accessed here (link to pdf document):
The purpose of the study was to investigate the possibility of creating a product label which provides consumers with information about the environmental lifecycle performance of the product. This information may be added to the current Energy Label which already displays the energy efficiency rating of the product as well as other product specific characteristics (such as spin speed, noise level and capacity on a washing machine). The research has tested two options for a new label:
1. Proposed Energy and Environmental Label - the current Energy Label plus four additional environmental lifecycle indicators ( carbon footprint, water footprint, resource depletion and water eco-toxicity )
2. Proposed Energy and Carbon Footprint Label - the current Energy Label plus only the lifecycle carbon footprint indicator."

The current and trial labels can be seen on Figure 1, p. 1 of the report.

The main questions to be answered by this study:
Key findings from Phase 1 - What is the possibility of creating a new product label incorporating environmental indicators?...in essence the indicators are not matured enough to make their use on labels mandatory...
Key findings from Phase 2 and Phase 3 - What impact could a new environmental label have on consumer attitudes and behaviours?...there is evidence from this study to suggest that a new Energy Label incorporating other environmental performance symbols could have a positive impact on consumer purchasing behaviour.

...more detailed results can be found in the above mentioned report.

Maybe a discussion evolves here regarding the topic of labels.