For any water based product you would need to have broad spectrum preservatives added. You also have to have challenge testing done on any product intended for retail sale. If you skip these basic safety requirements you risk having legal action taken against you. Citric acid is not a suitable preservative for a commercial product. Do you live in a country without any regulations? If so you should probably only sell locally since it would be illegal to sell something like that in the UK, Australia, China, Japan or the US.