{
	"forge_marker": 1,
	"variants": {
		"normal": {
			"model": "forge:fluid",
			"custom": {
				"fluid": "normal"
			}
		},
		"normalgas": {
			"model": "forge:fluid",
			"custom": {
				"fluid": "normalgas"
			}
		},
		"static": {
			"model": "forge:fluid",
			"custom": {
				"fluid": "static"
			}
		},
		"staticgas": {
			"model": "forge:fluid",
			"custom": {
				"fluid": "staticgas"
			}
		}
	}
}

{
	"forge_marker": 1,
	"defaults": {
		"model": "forge:fluid"
	},
	"variants": {
		"normal": [
			{
				"custom": {
					"fluid": "normal"
				}
			}
		],
		"normalgas": [
			{
				"custom": {
					"fluid": "normalgas"
				}
			}
		],
		"static": [
			{
				"custom": {
					"fluid": "static"
				}
			}
		],
		"staticgas": [
			{
				"custom": {
					"fluid": "staticgas"
				}
			}
		]
	}
}

Move model to defaults section in blockstates file
Fluids: Move model to defaults section in blockstates file
