When nothing else is specified in a synthesis, "acetic acid" in the chemical literature always refers to 100% Glacial Acetic Acid.
Hydrazine Hydrate corresponds to 65% aqueous hydrazine, as hydrazine (N2H4) has a molar weight of 32 g/mol, while water (H2O) is 18g/mol. (32+18)/32 = 0.65
I must however stress that I do not reccommend that you handle neither iodine monochloride or hydrazine hydrate, given your apparently limited knowledge of chemistry. There are several other methods at your disposal (not requiring nearly as noxious chemicals) for performing the desired chemical transformation, like the following two:
None (https://www.thevespiary.org/rhodium/Rhodium/chemistry/doisynth.html)
(https://www.thevespiary.org/rhodium/Rhodium/chemistry/doisynth.html)
Post 383499 (https://www.thevespiary.org/talk/index.php?topic=11530.msg38349900#msg38349900)
(Barium: "A little 2C-I perhaps", Novel Discourse): Potassium Iodide/Oxone
See Post 381740 (https://www.thevespiary.org/talk/index.php?topic=7353.msg38174000#msg38174000)
(PolytheneSam: "Gabriel sythesis patents", Chemistry Discourse)
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