Weigh your final paste weight then start with half the amount of water. So if you have 500 grams of paste, add 250 grams of water. Slowly add more water until you get the paste completely dissolved and the viscosity you want. You'll probably end up using more water but 50% is a good starting point. With liquid soap things work a bit differently so don't calculate based on the oil weight you used, base it on the final paste weight. Keep good notes on the amount of water you add so it's a bit faster the next time you dilute. It'll still be a bit different but you'll have a good starting point.
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