Acidity of fluids is tightly regulated. Acidity is measured by what is called pH, which is related to the concentration of the hydrogen ion (H+). The pH of blood is maintained between 7.35 and 7.45. This is needed;for example for the activity of enzymes. The kidneys are very important for the excretion of excess acid, resulting from our food intake.
Your blood pressure and heart rate are also regulated: the standard normal values are 120/80 for blood pressure and about 60‐80 beats/minute for heart rate. Again this will vary depending on conditions: ifyou do exercise, your heart rate increases.