What could be the reason for yellow tinted/slight white layer on tongue? i have bad acid reflux, urinary problems, and don't drink much water.

White tongue common: The tongue is known to have many variations with pigmenting, size, appearance, ; not always due to disease. Causes of a tongue that looks white include: lichen planus (responds to steroids), white sponge nevus (familial, benign, permanent), smoker's leukoplakia (2% risk of cancer, needs biopsy), hairy leukoplakia (due to epsteinbarr virus), warts (due to papillomavirus), "thrush" (rx antifungals).