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(The following assumes you are talking about a submersible well pump, and not a sump pump or sewage ejector pump). Submersible pumps come in two sections. The water end and the motor. The water end should be filled by the well water as the pump operates. There's nothing to refill here. Most submersible pumps are powered by motors built by Franklin-Electric. (There should be a nameplate on the motor). Franklin's motors are filled with non-toxic antifreeze, not oil. The bearings are designed to be floating and/or water lubricated. The antifreeze has to be non-toxic because it may leak over time and you will end up drinking it. When submerged in the well, well water is allowed to replace any lost antifreeze. (The antifreeze is there so that below-freezing temperatures during initial shipment and storage will not damage the pump. It isn't needed during opeartion). If you promise not to let the motor freeze, (put the pump assembly back down the well -- don't let it sit in the unheated shop), just fill the motor up with drinkable water. If you want to replace the antifreeze, it is supposed to be food-grade propylene glycol. You can read more about it here:
http://www.franklin-electric.com/Manual/AIM_03.htm
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