This is probably something you already know but a reminder doesn’t hurt on such a hot day.
You don’t need syrup or real coffee to make an iced coffee or Big M style drink.
Stirring instant coffee and sugar into a very little hot water first dissolves the crystals, avoiding the grittiness and unsweetened taste of throwing them straight into cold milk. Ice cubes or icecream optional.
If you have any icecream toppings or another kind of syrup those can also be a milk flavouring.
They have the price tag of a spice. High upfront cost, but you only use a small amount each serve.
You can experiment with the others, but nearly all supermarket ice coffees contain caramel. Vanilla didn’t do the trick for me.
I have an unhealthy dare addiction I needed to curb a few years back, spent months perfecting my home dare recipe haha