Blessing of the Devoted Worshipper

You can go pray/meditate for 1 hour each week. After this prayer/meditation, you gain a blessing from your god. In the next 7 days, you can expend one of your blessings and gain advantage on any d20 roll that is an attack, skill check, or saving throw. You must decide to expend your blessing before rolling. At the end of the week, you lose the blessing if you have not used it that week, and you must pray/mediate to gain it back. You also gain proficiency in religion. if you already have it, you gain expertise. 

In addition, you can spend an additional hour to a number of vials of water, equal to your proficiency modifier, each week. This blessed water can be used to drink or throw at a creature as an action. The blessed water has three potential effects, though you can only choose one per vial (chosen at the time in which you bless the vial). The vials lose their blessing after 7 days and you can only have a maximum of vials equal to your proficiency modifier. 

Effect 1: Heal 1d6 + WIS worth of HP.

Effect 2: Suppress the effects of any one disease, effect, or ailment (not exhaustion) for 24 hours.

Effect 3: Give resistance to necrotic damage for 1 hour.