We like to use Lyres' Agave Blanco Spirit and Orange Sec, but you can also find other options like Ritual Zero Proof's Tequila Alternative. As far as we know, Lyre's is the only one with a triple sec alternative. They have another non-alcoholic tequila (Agave Reserva), but we prefer the taste of the blanco one for this drink. You can easily find these online through the brand's site or through sites like No & Low which specialize in low ABV drinks.