Where to Prepare for Mikveh Immersion
A woman may prepare for immersion either at home or at the mikveh, whichever is more convenient. Most modern mikvaot have preparation rooms with showers and bathtubs. Mikveh protocol varies somewhat with geographical location. Larger mikvaot are generally well-supplied with soap, shampoo, towels, and other necessary equipment, sometimes for a nominal fee. In smaller towns, a woman may be expected to bring the supplies she needs from home. For hygienic reasons, toothbrushes and similar items should be brought from home, but they can often be purchased at the mikveh if necessary.
A woman who prepared at home should comb her hair again at the mikveh, wet her body and hair in the shower, and inspect herself immediately before immersing. For the procedure on Shabbat see Mikveh Preparation on Erev Shabbat and Yom Tov.