To be fair, the regular CWE is perfectly safe as long as your technique is vaguely correct. I practically lived off them for 2 years, on top of heavy non-CWE paracetemol use with or without codeine (often popping 4 - 8 panadeine or regular panadol at a time), and my liver function is perfect. I'm not trying to encourage that kind of behavior, obviously it was silly (my back was fucked and pain makes you desperate), but the toxicity of paracetemol is overstated and people are far more paranoid than they need to be about CWE's. People act as if going a single pill over the 4g/day limit will kill you or do permanent damage, when in reality that limit is set to cover pharmaceutical companies asses in the case of elderly people or those with impaired liver function - it's basically the lowest possible limit and suggested dose they could set and still market the stuff as an analgesic. Ibuprofen is far more worrying imo, I used it in similar quantities and my stomach has never been the same since (I've been thinking about getting checked for a small ulcer or bleed in my stomach for a while now).
The reality is that if you use a coffee filter or cloth cut from a tightly woven business shirt, use cool tap water (no need to put it in the fridge, doing so makes absolutely no difference to the final outcome) and no more of it than is necessary to dissolve the pills/get all of the gunk into the filter, and then perform the CWE properly so there's no leaks and no solids in the final solution, the solubility of paracetemol is such that your CWE will contain less paracetemol than 2 - 3 panadol. Look at the chart on erowid and do the math yourself if you don't believe me. Given that the ceiling dose and enzyme inhibition makes it impossible to drink more than 3 CWE's a day (in my experience if you don't wait 5 - 6 hours between one dose and the next, the second dose will do nothing or have a greatly reduced effect), even drinking the maximum amount of CWE's you can in a day will give you, worst case scenario, the equivalent of 8 - 10 panadol.
Again: cool tap water, no solids in your solution and no absurd amounts of water (if you can fit your CWE into a cup pre-dilution, you're probably fine) and your liver will be just fine.