How can I safely walk through Electric water in DX:HR?

Solution 1:

The EMP Shielding augmentation will protect you from electric shock (and EMP grenades, etc).

This is one of the Dermal Armor augmentations - listed in the Skin Augmentations section of the aug screen - and you will first need to unlock Damage Reduction 2.

It will cost a total of 4 Praxis points to obtain if you don't have any prerequisites:

• 2 to unlock Dermal Armour and Damage Reduction 1
• 1 to unlock Damage Reduction 2
• 1 to unlock EMP Shielding

Solution 2:

Yx comment would deserve to become an answer: using heavy crates (not the destructible ones) is way faster and easier than getting the EMP Shielding augmentation (requiring XP).