Could a diaper rash be caused from water, and what's a good poo color?

i just found out that my mother in law gives my 3 month old 3 oz of water after giving her 4oz bottle. she says it helps her burb and washes her mouth out. is that really needed? and also she keeps getting a rash from poopy diapers it seems every week it goes away and then comes back on the weekend. which my mil watches her most fridays. could that be from the water? and also another ? what is- so to say ok poo and bad poo like color? thank you in advance!

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