What font is the Evian logo? Helvetica? No. Arial? Yes. No. Well sort of.
It starts out as a version of Arial Regular (slightly different cut to Helvetica) which is then modified to personalise it to Evian. Here’s the ‘evian’ wording below on its own:
and here’s the logo with Arial Regular super-imposed over the top so you can see the differences:
So, with a slight tweak to the ‘e’ and ‘a’ and by moving the dot of the ‘i’ you’ll have the evian logo.