how can I make this local script affect all the parts with the same name?

This script makes a local players thirst bar go up when they touch water. However, if there are more then one brick with the same name, it does not work, does anyone know how to get around this and make it work?

-- Localscript
repeat wait() until game.Players.LocalPlayer and game.Players.LocalPlayer.Character
local player = game.Players.LocalPlayer
local character = player.Character
local block  = game.Workspace:FindFirstChild("Water")
wait()
local thirst = game.Players.LocalPlayer.ThirstVal  
local debounce = false

block.Touched:connect(function(p)
    if debounce then return end
    debounce = true
    local humanoid = p.Parent:FindFirstChild'Humanoid'
    if humanoid and p.Parent == character then
        thirst.Value = thirst.Value + 10
if thirst.Value > 100 then
	thirst.Value = 100
end
    end
    debounce = false
end)

This is another take on it that doesn't work...

-- Localscript
repeat wait() until game.Players.LocalPlayer and game.Players.LocalPlayer.Character
local player = game.Players.LocalPlayer
local character = player.Character
local block  = game.Workspace:GetChildren()

wait()
local thirst = game.Players.LocalPlayer.ThirstVal  
local debounce = false

player.Character.HumanoidRootPart.Touched:connect(function(p)
	if block.Name == ("Water")
	then
    if debounce then return end
    debounce = true
    local humanoid = p.Parent:FindFirstChild'Humanoid'
    if humanoid and p.Parent == character then
        thirst.Value = thirst.Value + 10
if thirst.Value > 100 then
	thirst.Value = 100
end
else
	print("a")
    end
    debounce = false
	end
end)

I editted your script to be a Server Script, hope this helps

local block  = game.Workspace:FindFirstChild("Water")
wait()
local debounce = false

block.Touched:connect(function(p)
    if p.Parent:FindFirstChild("Humanoid") and game.Players:FindFirstChild(p.Parent.Name) then
		local character = p.Parent
		local thirst = game.Players:FindFirstChild(p.Parent.Name):FindFirstChild("ThirstVal")
	    if debounce then return end
	    debounce = true
	    local humanoid = p.Parent:FindFirstChild('Humanoid')
	    if humanoid and p.Parent == character then
	        thirst.Value = thirst.Value + 10
			if thirst.Value > 100 then
			    thirst.Value = 100
			end
	    end
	    debounce = false
	end
end)

This will work with all parts called "Water" (You can change this on the first line...)

local block = "Water"
wait()
local debounce = false
local thirst = game.Players.LocalPlayer:WaitForChild("ThirstVal")
repeat wait() until  game.Players.LocalPlayer.Character
local character = game.Players.LocalPlayer.Character

game.Players.LocalPlayer.Character.HumanoidRootPart.Touched:connect(function(p)
    if p.Name == block then
		thirst.Value = thirst.Value + 10
		if thirst.Value > 100 then
			thirst.Value = 100
		end
   end
end)

Good Luck with your games