Ivana,
I'm male. So maybe I'm not the best source of information for you and your needs.
P&B shakes won't give you intestinal problems. When taking P&B shakes, there will be times when you need to go to the bathroom, RIGHT NOW. They won't cause leaky gut syndrome.
Find a source of purified water that you can afford. Take probiotics if you have a source. If you can't get probiotics, eat yogurt when possible.