Potion next to the shop

[yompa93]

local ratio = 2.7     -- 100 mana potions = 270.00oz
local PotionID = Item.GetID("mana potion")
local PotionPrice = 50
local PotionName = "mana potion"

--Spells
prio1 = "exevo gran mas vis"
prio2 = "utana vid"
prio3 = "exura vita"

while(true) do
    if (Self.ItemCount(PotionName) > 0) then --using all of the mana potions
        while (Self.ItemCount(PotionName) > 0) do
            if Self.CanCastSpell(prio1) then
            Self.Cast(prio1)
            elseif (not Self.CanCastSpell(prio1)) then
            if Self.CanCastSpell(prio2) then
            Self.Cast(prio2)
            elseif (not Self.CanCastSpell(prio2)) then
            if Self.CanCastSpell(prio3) then
            Self.Cast(prio3)
            end
        end
    end
end
    else -- we must buy more potions
        --firstly, sell flasks..
        Self.SayToNpc({"hi", "trade"}, 100)
        if (Self.Flasks() > 0) then
            while (Self.Flasks() > 0) do
            Self.ShopSellFlasks()
            end        
        end
        
        -- lets buy potions
        if (Self.Money() > 0) then -- just to reduce amount of gold coins (wasting cap)
            while (Self.ItemCount(3031) > PotionPrice) do
                Self.ShopBuyItem(PotionID, 1)
                sleep(math.random(300,900))
            end
            
            while ((Self.Cap() > (ratio * 100 + 10)) and (Self.Money() > PotionPrice * 100)) do
                Self.ShopBuyItem(PotionID, 100)
                sleep(math.random(300,900))
            end
            
            while ((Self.Cap() > (ratio * 10 + 10)) and (Self.Money() > PotionPrice * 10)) do
                Self.ShopBuyItem(PotionID, 10)
                sleep(math.random(300,900))
            end
        end
        
    end

    sleep(math.random(600,1400))
end 

Made it abit different, more user friendly i guess.
Use the support tab for potions, or use another script to do it.
I can also add the Mana on follow if you need it:

local ratio = 2.7     -- 100 mana potions = 270.00oz
local PotionID = Item.GetID("mana potion")
local PotionPrice = 50


while(true) do
    if (Self.ItemCount(PotionID) > 0) then
        Self.UseItemWithFollow(PotionID)
    elseif (Self.Flasks() >= 0) then
            while (Self.Flasks() > 0) do
                Self.SayToNpc({"hi", "trade"}, 100)
                Self.ShopSellFlasks()
            end
        -- lets buy potions
        if (Self.Money() > 0) then -- just to reduce amount of gold coins (wasting cap)
            while (Self.ItemCount(3031) > PotionPrice) do
                Self.ShopBuyItem(PotionID, 1)
                sleep(math.random(300,900))
            end
            
            while ((Self.Cap() > (ratio * 100 + 10)) and (Self.Money() > PotionPrice * 100)) do
                Self.ShopBuyItem(PotionID, 100)
                sleep(math.random(300,900))
            end
            
            while ((Self.Cap() > (ratio * 10 + 10)) and (Self.Money() > PotionPrice * 10)) do
                Self.ShopBuyItem(PotionID, 10)
                sleep(math.random(300,900))
            end
        end
    end
    sleep(math.random(600,1400))
end