1996 Ford Bronco Owner's Manual - Page 309

If the level gets low, you can add tap water to the battery, provided the water isn't hard or doesn't have a high mineral or alkali content. However, if possible you should refill the battery with distilled water. If the battery needs water quite often, have the charging system checked for a possible malfunction. Help Us Protect Our Environment Ford Motor Company strongly recommends that used lead-acid batteries be returned to an authorized recycling facility for disposal. Battery recycling symbol RWARNING Batteries normally produce explosive gases which can cause personal injury. Therefore, do not allow flames, sparks or lit tobacco to come near the battery. When charging or working near a battery, always cover your face and protect your eyes, and also provide ventilation. RWARNING Batteries contain sulfuric acid which burns skin, eyes, and clothing. 312