Please verify for: a) bug in addBottle - creating 2 bottles for Id 0, b) coherence of code structure. (functions drink and fill still untested/not finished)

Code Review - bottleManagement Object

let bottleManagement = {
    bottles: {},
    nextId: 0,
    addBottle: function (totalVol, currentVol, liquid){
        let Bottle = function (id, totalVol, currentVol, liquid){
            this.id = id;
            this.totalVol = totalVol;
            this.currentVol = currentVol;
            this.liquid = liquid;
        };
        bottleManagement.bottles[this.nextId] = new Bottle (this.nextId, totalVol, currentVol,liquid);
        this.nextId++;
    },
    getBottle: function(id){
        return bottleManagement.bottles[id];
    },
    getAllBottles: function(){
        return bottleManagement.bottles;
    },
    updateCurrentVol: function(id, newCurrentVol){
        bottleManagement.bottles[id].currentVol = newCurrentVol;
    }  
};


let HydrationStatus = function (dailyIntake, remainingThirst){
    this.dailyIntake = dailyIntake;
    this.remainingThirst = remainingThirst;
}


function setHydrationStatus (dailyIntake, remainingThirst){
    let hydrationStatus = new HydrationStatus (dailyIntake, remainingThirst);
    return hydrationStatus;
}


function drink (bottle, thirst){
    let newHydrationStatus;
    newHydrationStatus.currentVol = bottle.currentVol - thirst;
    if (thirst > bottle.currentVol){
        newHydrationStatus.remainingThirst = thirst - bottle.currentVol;
    } else {
        newHydrationSstatus.remainingThirst = 0;
    }
    return newHydrationStatus;
}

function fill (bottle, refill){
    let newCurrentVol;
    let leftOver = refill - (bottle.totalVol - bottle.currentVol);
    if (leftover > 0){
        alert("Can only fill this bottle up to " + leftover + "ml!")
    } else {
        newCurrentVol = bottle.currentVol + refill;
    }
    return newCurrentVol;
}