I always water with tap water that has been left to stand, which then also takes on room temperature of 19 to 21 degrees Celsius. It shouldn’t be too cold so that the roots don’t catch a cold. 
I also think that a smaller pot size and then several plants can quickly lead to a nutrient deficiency, and also the lack of space for the roots could eventually become a problem. Although in a 100-liter bed, 2 - 3 ladies should hopefully get along very well.
I think for a smaller cultivation area, a larger pot and one plant!
A slightly longer growth phase brings more in the end. The substrate, as well as how one feeds. Whether directly the plant, or rather just the soil with its fungal cultures and bacteria, also makes a difference in how things can run better.
But so far, despite the tight spot, it’s looking beautifully green for herr_gruen. And with that, I send my best regards to you all. From my side, there are currently no plants because everything is in drying. Meanwhile, cleaning fabric pots and other cleaning, and already planning and preparing new plants, but good things take time. Until then, Pflanzenpaule