Yes, you can absolutely drink culinary grade matcha, though the experience will differ from ceremonial grade.
Culinary grade matcha has a stronger, more bitter taste when consumed on its own, which some people find less enjoyable. However, it works wonderfully in drinks when combined with other ingredients like:
Cost consideration: Since culinary grade is significantly less expensive, many people prefer it for daily matcha lattes rather than using premium ceremonial grade. You'll still get the same nutritional benefits including antioxidants, caffeine, and L-theanine.
If you're drinking matcha traditionally (just whisked with hot water), ceremonial grade provides a superior taste experience. But for mixed beverages, culinary grade is perfectly suitable and budget-friendly.