Including ice in water measurements?

Hi, I’ve purchased my Huel and just in research mode before I start using.
One question so far - after watching the video on how to mix huel I was wondering about blending with ice. If I’m adding 500mls of water - should I measure that with ice cubes included? or do 500mls of water and then add in ice? I’m not sure if it will make any difference, but just curious what everyone else does who blends with ice?

There are no set amounts of water you need to mix Huel; simply adjust to your preference