Aw, ang ganda ng patience mo with baby acne, mama! Honestly, you're doing it exactly right, water lang sa face is really the best approach kasi baby skin is super sensitive pa, and most soaps will just irritate it more. A lot of my mum friends had the same experience na kahit walang special treatment, the acne cleared up on its own by 3-4 months, so you're probably close na! Just keep doing what you're doing, simple routine, gentle touch, at the rest ay aaral ng sarili ng skin ng baby.