Tony, at that acidity level I would not use that water to bathe, drink, or wash clothes without correcting. You need to know "what" acid it is. Wines do not need just an acidic solution - the yeast & the wine itself is looking for specific acids: malic, tartaric, or citric, etc - if your acid is sulfuric for example you will have a strong sulfur taste & perhaps a fermentation problem. You also need to be aware of what acid you have to purchase the proper salts to add and the proper filtration system to remove whatever solids then precipitate after treatment. At 4.9 you will probably have a pretty high TDS & chloride levels.